## 2019 MRSej, Vol. 21,

art. no. 19101 (7 pp.)   Gafurov M., Galukhin A., Osin Y., Murzakhanov F., Gracheva I., Mamin G., Orlinskii S.B.
Probing the surface of synthetic opals with the vanadyl containing crude oil by using EPR and ENDOR techniques

art. no. 19102 (6 pp.)   El-Damrawi G., Abou Elzahab M. Dowadair A. Hosny A.
Electron paramagnetic resonance study on phosphosilicate glasses

art. no. 19103 (5 pp.)   Aleksandrov A.S., Egorov A.V., Korableva S.L., Tagirov M.S.
Anomalous 141Pr nuclear magnetic relaxation in PrF3 Van Vleck paramagnet

art. no. 19104 (7 pp.)   Kuzmin V.V., Bogaychuk A.V., Nekrasov I.K., Safiullin K.R., Salakhov M.H., Alakshin E.M., Klochkov A.V., Tagirov M.S.
The home-built high-field multifunctional pulsed NMR spectrometer

art. no. 19105 (7 pp.)   Shurtakova D., Yavkin B., Gafurov M., Mamin G., Orlinskii S., Kuznetsova L., Bakhteev S., Ignatyev I., Smirnov I., Fedotov A., Komlev V.
Study of radiation-induced stable radicals in synthetic octacalcium phosphate by pulsed EPR

art. no. 19106 (5 pp.)   Bochkin G.A., Fel’dman E.B., Lazarev I.D., Vasil’ev S.G., Volkov V.I.
Decay of multiple quantum NMR coherences in quasi-one-dimensional chains in calcium fluorapatite

art. no. 19107 (10 pp.)   Bochkin G.A., Fel’dman E.B., Lazarev I.D., Vasil’ev S.G.
Contributions of different parts of dipole-dipole interactions to relaxation of multiple quantum NMR coherences in a single crystal of calcium fluorapatite

## 2018 MRSej, Vol. 20,

To memory of Prof. Charles Pence Slichter

art. no. 18102 (9 pp.)   Gizatullin B.I., Savinkov A.V., Shipunov T.V. Melnikova D.L., Doroginitzky M.M., Skirda V.D.
Investigation of molecular mobility and exchange of n-hexane and water in silicalite-1 by 2D 1H NMR relaxometry

art. no. 18103 (7 pp.)   El Ouaddi H., Tirbiyine A., Taoufik A., Ait Ahmed Y., Hafid A., Mamor M., Chaib H., Nafidi A., Snoussi S.
Disorder effect and the vortex phase transition in layered organic superconductor κ-(BEDT-TTF)2Cu[N(CN)2]Br

art. no. 18104 (8 pp.)   Borich M.A., Savchenko S.P., Tankeyev A.P.
Degenerated nuclear magnetostatic modes in ferromagnets

art. no. 18201 (9 pp.)   Gabbasov B.F., Gracheva I.N., Nikitin S.I., Zverev D.G., Dejneka A., Trepakov V.A., Yusupov R.V.
Experimental evidences of the shape-induced structural distortion of SrTiO3 single crystals from impurity Mn4+ ions electron paramagnetic resonance

art. no. 18202 (7 pp.)   El-Damrawi G. , Hassan A.K., Shahboub A.
31P and 27Al nuclear magnetic resonance studies on silver phosphate glasses

art. no. 18203 (5 pp.)   Galukhin A., Osin Y., Rodionov A., Mamin G., Gafurov M., Orlinskii S.
Radiation-induced paramagnetic centers in nanoporous synthetic opals - a probe for near surface protons (published as Rapid Communication)

art. no. 18204 (5 pp.)   Yanilkin I.V., Vakhitov I.R., Gumarov A.I., Pasynkov M.V., Mukhametova E.T., Aliyev M.N., Yusupov R.V., Tagirov L.R.
Magnetic and magnetoresonant properties of thin-film Fe/Ag/Co/CoO heterostructure synthesized by combined molecular beam epitaxy and reactive magnetron sputtering (published as Rapid Communication)

art. no. 18206 (9 pp.)   Dolgorukov G.A., Kuzmin V.V., Bogaychuk A.V., Alakshin E.M., Safiullin K.R., Klochkov A.V., Tagirov M.S.
The home-built pulse NMR spectrometer with CPMG sequence for 3He research at low temperatures

## 2017 MRSej, Vol. 19,

art. no. 17101 (17 pp.)   Khalvashi E.Kh., Fokina N.P., Elizbarashvili M.O.
Angular and temperature dependencies of EPR linewidth and Gorter relaxation rates in concentrated paramagnets: Application to La0.9Sr0.1MnO3 and La0.875Sr0.125MnO3

art. no. 17102 (11 pp.)   Khasanova N.M., Gabdrakhmanov D.T., Kayukova G.P., Mikhaylova A.N., Morozov V.P.
EPR study of hydrocarbon generation potential of organic rich domanik rocks

art. no. 17202 (7 pp.)   Savinkov A.V., Shakurov G.S., Mumdzhi I.E., Malkin B.Z., Nikitin S.I., Korableva S.L., Tagirov M.S.
Spectral and magnetic properties of impurity Tm3+ ions in YF3

art. no. 17203 (4 pp.)   Dooglav A.V., Gilmutdinov I.F., Katkov V.I., Kiiamov A.G., Mukhamedshin I.R.
89Y nuclear spin-lattice relaxation in SrY2O4:Ho3+ single crystals (published as Rapid Communication)

art. no. 17204 (5 pp.)   Alakshin E.M., Kondratyeva E.I., Nuzhina D.S., Iakovleva M.F., Gilmutdinov I.F., Kuzmin V.V., Safiullin K.R., Kiiamov A.G., Klochkov A.V., Tagirov M.S.
Magnetic properties of DyF3 micro- and nanoparticles (published as Rapid Communication)

art. no. 17205 (5 pp.)   Savinkov A.V., Gabbasov B.F., Morozov O.A., Kiiamov A.G., Tagirov M.S.
Study of the crystal field and rare-earth magnetism in YF3:Yb3+ (published as Rapid Communication)

art. no. 17206 (4 pp.)   Gafurov M.R., Mamin G.V., Kurkin I.N., Rodionov A.A., Orlinskii S.B.
Superhyperfine interactions in Ce3+ doped LiYF4 crystal: ENDOR measurements (published as Rapid Communication)

art. no. 17207 (10 pp.)   Murzakhanov F., Gabbasov B., Iskhakova K., Voloshin A., Mamin G., Putlyaev V., Klimashina E., Fadeeva I., Fomin A., Barinov S., Biktagirov T., Orlinskii S., Gafurov M.
Conventional electron paramagnetic resonance for studying synthetic calcium phosphates with metal impurities (Mn2+, Cu2+, Fe3+)

art. no. 17209 (9 pp.)   Irisova I.A., Gracheva I.N., Lysogorskiy Y.V., Shinkarev A.A., Rodionov A.A., Tayurskii D.A., Yusupov R.V.
Electron paramagnetic resonance and X-ray diffraction study of PbF2 fine powders mechanochemically doped with Er3+ ions

## 2016 MRSej, Vol. 18,

art. no. 16101 (7 pp.)   Dolomatov M.U., Rodionov A.A., Gafurov M.R., Petrov A.V., Biktagirov T.B., Bakhtizin R.Z., Makarchikov S.O., Khairudinov I.Z., Orlinskii S.B.
Concentration of paramagnetic centres at low-temperature thermal destruction of asphaltenes of heavy petroleum distillates

art. no. 16102 (5 pp.)   Gracheva I.N., Gafurov M.R., Mamin G.V., Biktagirov T.B., Rodionov A.A., Galukhin A.V., Orlinskii S.B.
ENDOR study of nitrogen hyperfine and quadrupole tensors in vanadyl porphyrins of heavy crude oil

art. no. 16103 (5 pp.)   Ivanova T.A., Turanova O.A., Mingalieva L.V., Gilmutdinov I.F., Ovchinnikov I.V.
Electronic and magnetic properties of [Fe(3-MeO-Qsal)2]Y•n solvent (n = 0,1) complexes

art. no. 16104 (5 pp.)   Tikhonov N.I., Khutsishvili S.S., Lesnichaya M.V., Dolmaa G., Vakul’skaya T.I., Aleksandrova G.P., Sukhov B.G.
Paramagnetic properties and antioxidant activity of metal-containing bionanocomposites based on humic substances

No 2.
This issue was selected at XIX International Youth Scientific School "Actual problems of magnetic resonance and its application", Kazan, 24 - 28 October 2016. All papers were recommended to publication in our journal and they are published after additional MRSej reviewing. The MRSej Editors, Prof. M.S. Tagirov and Prof. V.A. Zhikharev, are responsible for the issue.

art. no. 16201 (8 pp.)   Dzheparov F.S., Lvov D.V.
Impurity spin in normal stochastic field: basic model of magnetic resonance

art. no. 16202 (6 pp.)   Bochkin G.A., Fel'dman E.B., Vasil'ev S.G.
Dipolar relaxation of multiple-quantum NMR coherences in a linear homogeneous chain of 19F nuclei in calcium fluoroapatite

art. no. 16203 (5 pp.)   Gimazov I.I., Sakhin V.O., Talanov Yu.I., Adachi T., Noji T., Koike Y.
Superconducting fluctuations above critical temperature in the Bi2Sr2Ca1-xYxCu2O8 single crystals

art. no. 16204 (6 pp.)   Alakshin E.M., Klochkov A.V., Korableva S.L., Kuzmin V.V., Nuzhina D.S., Romanova I.V., Savinkov A.V., Tagirov M.S.
Magnetic properties of powders LiTbF4 and TbF3

art. no. 16206 (5 pp.)   Shafikov F.F., Savinkov A.V., Tagirov M.S.
Study of the crystal field in CeF3 and CeF3:Pr3+

art. no. 16207 (8 pp.)   Salikhov T., Klysheva E., Zvereva E., Nalbandyan V., Shukaev I., Medvedev B., Vavilova E.
Lithium diffusion in a new cathode material Li0.8[Ni0.6Sb0.4]O2 studied by 7Li NMR

art. no. 16208 (4 pp.)   Vorobeva V.E., Domracheva N.E., Gruzdev M.S.
EMR searching of quantum behavior of magnetic γ-Fe2O3 nanoparticles encapsulated into poly(propylene imine) dendrimer

art. no. 16209 (9 pp.)   Sapunov V.A., Denisov A.Y., Saveliev D.V., Soloviev A.A., Khomutov S.Y., Borodin P.B., Narkhov E.D., Sergeev A.V., Shirokov A.N.
New vector/scalar Overhauser DNP magnetometers POS-4 for magnetic observatories and directional oil drilling support

art. no. 16210 (4 pp.)   Sapunov V.A., Rasson J., Sergeev A.V., Narkhov E.D., Denisov A.Y., Rubinstein B.Y., Sapunov A.V.
Application of Overhauser DNP and K optics INTERMAGNET quantum magnetometers to fundamental physics and cosmology

## 2015 MRSej, Vol. 17,

art. no. 15101 (7 pp.)   Yavkin B.V., Mamin G.V., Gafurov M.R., Orlinskii S.B.
Size-dependent concentration of N0 paramagnetic centres in HPHT nanodiamonds

art. no. 15104 (9 pp.)   Belov S.I., Kutuzov A.S.
Magnetic properties and spin kinetics in Kondo lattices

No 2.
This issue was selected at XVIII International Youth Scientific School "Actual problems of magnetic resonance and its application", Kazan, 26 - 30 October 2015. All papers were recommended to publication in our journal and they are published after additional MRSej reviewing. The MRSej Editors, Prof. M.S. Tagirov and Prof. V.A. Zhikharev, are responsible for the issue.

art. no. 15201 (6 pp.)   Balakirev N.A., Zhikharev V.A.
Computer simulation of growth and magnetic properties of quasi 2D magnetic cluster

art. no. 15202 (5 pp.)   Bunkov Yu.M., Klochkov A.V., Safin T.R., Safiullin K.R., Tagirov M.S.
Double magnetic resonance in MnCO3

art. no. 15204 (8 pp.)   Kondratyeva E.I., Safiullin K.R., Motygullin I.G., Klochkov A.V., Tagirov M.S., Kuzmin V.V.
Electron paramagnetic resonance and quantitative color investigations of various vacuum heat treated wood species

art. no. 15205 (4 pp.)   Bunkov Yu.M., Vetoshko P.M., Motygullin I.G., Safin T.R., Tagirov M.S., Tukmakova N.A.
Nonlinear FMR spectra in yttrium iron garnet

## 2014 MRSej, Vol. 16,

No 2.  SPECIAL ISSUE dedicated to Boris I. Kochelaev's 80th birthday

art. no. 14201 (9 pp.)   Atsarkin V.A., Demidov V.V., Sorokin B.V.
Resonance dc phenomena in manganite thin films

art. no. 14202 (7 pp.)   Fatkullin N.F., Valiullin R.
Short-time diffusion behavior of Brownian particles in porous solids

art. no. 14203 (19 pp.)   Nigmatullin R.R., Rakhmatullin R.M., Osokin S.I.
How to reduce reproducible measurements to an ideal experiment?

art. no. 14205 (6 pp.)   Maisuradze A., Shengelaya A., Pomjakushina E., Conder K., Keller H., Müller K.A.
Exponential temperature dependence of the Yb3+ relaxation in Y0.98Yb0.02Ba2Cu3Ox

art. no. 14206 (21 pp.)   Eremin M.V., Shigapov I.M., Eremin I.M.
Spin response in HTSC cuprates: generalized RPA approach with projection operators method

art. no. 14208 (14 pp.)   Garifullin I.A., Garif’yanov N.N., Leksin P.V., Kamashev A.A., Fominov Ya.V., Schumann J., Kataev V., Büchner B.
The peculiarities of the operation of the superconducting spin valve

art. no. 14209 (9 pp.)   Deminov R.G., Useinov N.Kh., Tagirov L.R.
Magnetic and superconducting heterostructures in spintronics

art. no. 14210 (10 pp.)   Schmidt B., Krug von Nidda H.-A., Riegg S., Ebbinghaus S.G., Reller A., Loidl A.
Probing the Metal-to-Insulator Transition in LaCu3RuxTi4-xO12 by Gd-ESR

art. no. 14302 (4 pp.)   Alakshin E.M., Bunkov Yu.M., Gazizulin R.R., Gazizulina A.M., Isaenko L.I., Klochkov A.V., Safin T.R., Safiullin K.R., Tagirov M.S., Vedenyapin V.N., Zhurkov S.A.
Long-lived free induction decay signal in CsMnF3 single crystal

## 2013 MRSej, Vol. 15,

art. no. 13101 (7 pp.)   Orlova A.Yu., Gainov R.R., Dooglav A.V., Pen'kov I.N.
A novel data on Ag5SbS4 and CuPbSbS3 probed by antimony NQR spectroscopy

art. no. 13102 (7 pp.)   Gafurov M.R., Yavkin B.V., Biktagirov T.B., Mamin G.V., Orlinskii S.B., Izotov V.V., Salakhov M.Kh., Klimashina E.S., Putlayev V.I., Abdul'yanov V.A., Ignatjev I.M., Khairullin R.N., Zamochkin A.V., Chelyshev Yu.A.
Atherosclerotic plaque and hydroxyapatite nanostructures studied by high-frequency EPR

art. no. 13104 (6 pp.)   Alakshin E.M., Gazizulin R.R., Klochkov A.V., Kuzmin V.V., Sabitova A.M., Safin T.R., Tagirov M.S.
The home-built pulse nuclear magnetic resonance spectrometer with digital quadrature detection for 3He research at low temperatures

art. no. 13201 (9 pp.)   Savina Yu., Bludov A., Pashchenko V., Gnatchenko S., Stepanov A., Lemmens P.
Specific features of electron spin resonance in quasi-1D magnet β-TeVO4

art. no. 13203 (9 pp.)   Irisova I.A., Rodionov A.A., Tayurskii D.A., Yusupov R.V.
EPR study of the CaF2 powder mechanochemical doping with rare-earth ions

## 2012 MRSej, Vol. 14,

art. no. 12101 (9 pp.)   Vishina A.A., Maisuradze A.
Spin-magnon relaxation of Yb3+-ions in antiferromagnetic cuprate Y1-xYbxBa2Cu3O6+y

art. no. 12102 (5 pp.)   Vishina A.A., Maisuradze A., Shengelaya A., Kochelaev B.I., Keller H.
Inhomogeneous broadening of the EPR signal of Yb3+ ions in domain walls of lightly doped antiferromagnetic cuprates

art. no. 12103 (15 pp.)   Belov S.I., Kutuzov A.S.
Spin kinetics in Kondo lattice with heavy fermions

art. no. 12203 (6 pp.)   Romanova I.V., Klochkov A.V., Korableva S.L., Kuzmin V.V., Malkin B.Z., Mukhamedshin I.R., Suzuki H., Tagirov M.S.
Studies of magnetization of lithium-rare earth tetra-fluoride single crystals

art. no. 12204 (7 pp.)   Galiullina L.F., Blokhin D.S., Aganov A.V., Klochkov V.V.
Investigation of "cholesterol + model of biological membrane" complex by NMR spectroscopy

art. no. 12205 (5 pp.)   Kozhanov K.A., Bubnov M.P., Cherkasov V.K., Abakumov G.A.
Versatile coordination sphere dynamics in o-semiquinonato pincer nickel complexes: an EPR study and mechanistic aspects

## 2011 MRSej, Vol. 13,

pp. 1-4   Khutsishvili S.S., Vakul'skaya T.I., Kuznetsova N.P., Ermakova T.G., Pozdnyakov A.S.
EPR investigation of nanosized silver particles in polymer composites

pp. 5-9   Gluschenko O.Yu., Polyakov N.E., Leshina T.V.
NMR study of cholesterol complexes with glycyrrhizic acid

pp. 10-13   Yankova T.S., Chumakova N.A., Pomogailo D.A., Vorobiev A.Kh.
Spin probe orientation distribution functions in aligned nematic liquid crystal

pp. 14-20   Konakov A.A., Ezhevskii A.A., Soukhorukov A.V., Guseinov D.V., Popkov S.A., Burdov V.A.
Temperature dependence of the conduction electron g-factor in silicon: theory and experiment

pp. 21-26   Manin A.Y., Efimov S.V., Klochkov V.V.
Obtaining spatial structure of cyclosporine (CsA) in chloroform using 2D NMR

## 2010 MRSej, Vol. 12,

pp. 1-6   Morozov E.V., Shabanova O.V., Pavlov V.F, Falaleev O.V.
Studying the initial stages of gelation process in colloidal silica on basis of synthetic silicates by NMR microimaging and relaxometry

pp. 7-11   Gubaev A.I., Rodionov A.A., Salakhov M.Kh., Subacheva I.N., Syrnikov P.P., Trepakov V.A., Yusupov R.V.
Photoinduced EPR in KTa0.988Nb0.012O3 crystals

pp. 12-16   Kutin Y.S., Mamin G.V., Orlinskii S.B., Silkin N.I.
Calculation of ZnO nanoparticle size distribution based on EPR line shape analysis

pp. 17-21   Dmitriev A.I., Chernenkaya A.S.
Spin dynamics and charge order-disorder phase transition detected by EPR in α'-(BEDT-TTF)2IBr2

pp. 22-25   Nizameev I.R., Pudovkin M.S., Kadirov M.K.
EPR, structural characteristics and intramolecular movements of some phenoxyl radicals in toluene

## Electron-phonon interaction in the 4f125d electronic configuration of the Tm2+ ion in CaF2

No 2.
pp. 20-23   M.S. Tagirov, V.A. Zhikharev

## XII International School for Young Scientists "Actual problems of magnetic resonance and its applications"

pp. 24-28   A.V. Fedorova, E.B. Fel'dman

## Multiple quantum NMR of interacting equivalent spins

pp. 29-32   I.A. Larionov

## Lorentzian form for the imaginary part of the dynamic spin susceptibility: comparison with NQR and Neutron Scattering data in copper oxide superconductors

pp. 33-37   Gazizulin R.R., Klochkov A.V., Kuzmin V.V., Safiullin K.R., Tagirov M.S., Yudin A.N.

## No 1. pp. 1-6   A. Sinicin, S. Borcov, V. Nadolinny, I. Kireenko, V. Kirillov     EPR of the transition metal ions in micro-plasma coatings on aluminum alloy D16 pp. 7-12    M.V. Eremin and I.E. Lyubin      Binding energy of a Cooper pairs with non-zero center of mass momentum in d-wave superconductors pp. 13-17    M.V. Burova, A.V. Fionov, M. Bonora, A. Lund, V.V. Lunin      Electron-acceptor Centers of Alkali Metal Modified Alumina Studied by the Anthraquinone as a Probe Molecule

No 2.
pp. 1-5   M.A. Fayzullin, V.A. Zhikharev
Image-Potential States in Small Metal Particles

## NMR Line Shape in Anisotropic Superconductors in Inclined Magnetic Fields

1997 To top of the Contents page
Volume 1, No 1, 17 pages (accepted: July 25, 1997).

Title: The Model Calculation of Angular Dependence of CESR Linewidth in Aluminium
Authors: Andrei B. Bondarenko, Yurii N. Proshin
Address: Department of Theoretical Physics, Kazan State University, Kremlevskaya, 18, Kazan 420008, Russia
e-mail:

Abstract: A simple model of the Fermi surface for an interpretation of the conduction electron spin resonance (CESR) results in Aluminium is developed. According to the real Aluminium Fermi surface 48 small rings with the large amount of the g-factor shift are arranged in five layers on the Fermi sphere, as distinct from the random distribution of them in the previous model proposed by Silsbee and Beuneu (SB). The present model reproduce known experimental CESR linewidth dependencies versus the frequency at different temperature region as well as the SB model. Additionally to the SB results the CESR linewidth is found to be independent from the magnetic field direction in the high temperature approximation. In both other cases (intermediate and low temperatures) the g-value anisotropy over Fermi surface is predicted to lead to the essential angular CESR linewidth dependence with five peaks. Some applications of the model to various systems with conduction electrons are discussed.

PACS: 76.30.Pk; 71.18.+y
Keywords: conduction electrons, Fermi surface, spin resonance, Aluminium
Sources:

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Volume 1, No 2, 10 pages  (accepted: December 8, 1997).

Title: Influence of strong electron correlations on the spin susceptibility in High-Tc cuprates
Author: I. Eremin
Address: Department of Theoretical Physics, Kazan State University, Kremlevskaya, 18, Kazan 420008, Russia
e-mail:

Abstract: A new formula for the dynamic spin susceptibility has been analyzed with taking into account the strong electron correlations. The correlations sufficiently modify the Stoner-like factor and as a consequence change the phase diagram of the instability. It is remarkable to note that the instability area moves to the low doping. The possible approximates (lorentzian and gaussian) of the real part of the spin susceptibility have been considered. The behavior of the correlation length with doping and temperature in both cases is discussed.

PACS: 74.25.Jb; 74.72.Bk
Keywords: High-Tc superconductivity, strongly correlated electronic system, spin susceptibility
Sources:

1. TeX-file (18 kB) or DVI-file (25 kB) or ZIP-ed DVI-file (12 kB)+ ZIP-ed EPS figures (37 kB)
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Volume 1, No 3, 6 pages  (accepted: December 11, 1997).

Title: Temperature dependencies of g-factors in GdBa2Cu3O6+x crystal.
Author: R. M. Eremina
Address: Kazan Physical-Technical Institute, 420029 Sibirskii trakt 10/7, Russia
e-mail:

Abstract: The temperature dependencies of the g-factors in GdBa2Cu3O6+x crystal are successfully explained using the suggestion that the big macroscopic magnetization of the samples due to the high concentration of Gd3+ ions (100 %) is responsible for the ESR signal. The difference of the temperature behavior of g-factors on the 35 GHz and 9.3 GHz is due to a different fraction of the penetration depth of the field in the superconductor.

PACS: 74.25.Jb; 74.72.Bk
Keywords: high-Tc superconductors, EPR
Sources:

1. TeX-file (11 kB) or DVI-file (15 kB or ZIP-ed DVI-file (8 kB)+ ZIP-ed EPS figures (24 kB)
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Volume 1, No 4, 9 pages  (accepted: December 23, 1997).

Title: NMR Line Shape in Anisotropic Superconductors in Inclined Magnetic Fields.
Authors: S.A. Efremova, Yu. N. Proshin, S.L. Tsarevskii
Address: Department of Theoretical Physics, Kazan State University, Kremlevskaya, 18, Kazan 420008, Russia
e-mail:

Abstract: The nuclear magnetic resonance line shapes within a primitive cell of the vortex lattice of the type II anisotropic superconductors in inclined magnetic fields are constructed taking into account a change of the local magnetic field inhomogeneity and skin - effect near the superconductor surface. The results of the numerical calculations show that the change of the direction of an external magnetic field modifies the parameters of the nuclear magnetic resonance line shapes. The derivative of the power of the absorption energy with respect to the magnetic field is calculated. It allows to obtain more detailed information about parameters of the superconductor such as an anisotropy parameter.

PACS: 74.60.-w; 74.60.Ge
Keywords: high-Tc superconductivity, nuclear magnetic resonance, vortex lattice
Sources:

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1998 To top of the Contents page
Volume 2, No 1, 25 pages  (accepted: February 4, 1998).

Title: The Singlet-Triplet Jahn-Teller Polar Centers in Copper Oxides
Authors: A.S. Moskvin, Yu.D. Panov
Address: Department of Theoretical Physics, Ural State University, 620083, Lenin Ave. 51,Ekaterinburg , Russia
e-mail:

Abstract: One of the most exciting features of the hole centers CuO45- in doped cuprates is in their unusually complicated ground state as a result of electronic quasi-degeneracy. An additional hole, doped to the basic CuO46- cluster with the b1g hole can occupy both the same hybrid Cu3d-O2p orbital state resulting in a Zhang-Rice singlet 1A1g and the purely oxygen eu molecular orbital resulting in singlet or triplet 1,3Eu  term with the close energies. We present a detailed analysis of the (pseudo)-Jahn-Teller effect driven by the near-degeneracy within the (1A1g, 1,3Eu)-manifold.

PACS: 71.27.+a, 74.20.s, 74.25.Ha, 76.60.-k
Keywords: cuprates, spin fluctuations, hyperfine coupling, nuclear resonance
Sources:

1. TeX-file (61 kB) or DVI-file (98 kB or ZIP-ed DVI-file (35 kB)+ ZIP-ed EPS figures (177 kB)
2. PostScript-file (805 kB) or ZIP-ed PostScript-file (258 kB)
3. PDF-file  (341 kB) or ZIP-ed PDF-file (233 kB)
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1999 To top of the Contents page

Volume 3, No 1, 13 pages  (accepted: April 23, 1999).

Title: Spin-lattice relaxation of Nd3+ and Tb3+ in phosphate and sodium borate silica glasses
Authors: B.M. Epel, S.B. Orlinskii, R.M. Rakhmatullin and Yu.K. Rosenzweig
Address: Kazan State University, Kremlevskaya, 18, Kazan 420008, Russia
e-mail: boris.epel@ksu.ru

Abstract: The experimental study of the electron spin-lattice relaxation (SLR) of Nd3+ and Tb3+ ions in phosphate and sodium borate silica glasses was performed. Measurements were made with electron spin echo technique. Temperature dependences of spin-lattice relaxation of the rare earth ions reveal the contribution of different relaxation mechanisms. A stepped like change of the SLR rate observed for Tb3+ and Nd3+ ions was explained by cross relaxation.

PACS: 71.55; 76.30
Keywords: glass, EPR, ESE, spin-lattice relaxation
Sources:

1. TeX-file (16 kB) or DVI-file (ZIP-ed DVI-file (10 kB)
2. ZIP-ed PostScript-file (158 kB)
3. PDF-file  (290 kB) or ZIP-ed PDF-file (190 kB)
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Volume 3, No 2, 8 pages  (accepted: October 5, 1999).

Title: EPR and evidence for two structural nonequivalent states  of Tl2+(II) paramagnetic centers near noncentral positions in Rb2SO4 and Cs2SO4 crystals
Authors: G.V. Mamin, V.N. Efimov
Address: Kazan State University, Kremlevskaya, 18, Kazan 420008, Russia

Abstract: The EPR spectrum temperature dependence of Tl2+(II) paramagnetic centers in Rb2SO4, Cs2SO4 crystals have been investigated. At 100K>T>40K the local symmetry of Tl2+(II) paramagnetic centers is C2. The broadening and doubling of EPR spectrum lines with decreasing of T<40K were observed. The angular dependence of lines positions indicate that two structural nonequivalent positions of Tl2+(II) paramagnetic center exist at T<20K. The measurement of dielectric constant of crystals displayed the absence of phase transition in this temperature range. The transformation of EPR spectrum is explained by motion ofTl2+(II) paramagnetic center between two structural nonequivalent states arising near noncentral positions. Parameters of the potential have been extracted by fitting of the temperature dependence of EPR spectrum. Two nonequivalent states are possible due to large difference between ionic radius of Tl2+(II) and Rb+, Cs+.

PACS: 71.55; 76.30
Keywords: electron paramagnetic resonance, noncentral ions, local dynamics
Sources:

1. TeX-file (15 kB) or DVI-file (22 kB or ZIP-ed DVI-file (10 kB)
2. PostScript-file (964 kB) or ZIP-ed PostScript-file (238 kB)
3. PDF-file  (265 kB) or ZIP-ed PDF-file (214 kB)
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2000 To top of the Contents page
Volume 4, No 1, 6 pages  (accepted: May 17, 2000).

Title: Determination of NMR-spectrum moments of F19 in CaF2 from the line shape parameters.
Author: B.M. Bolotov
Address: Institute of Physics and Technology, Ibragimova, 1, Almaty 480082, Kazakhstan
e-mail: bolotov@satsun.sci.kz

Abstract: Results of calculation of NMR line moments of F19 in CaF2 compared with experimental data are presented.

PACS: 76.60.-k;75.20.Ck
Keywords: nuclear magnetic resonance, line shape, moments
Sources:

1. TeX-file (11 kB)
2. PostScript-file (443 kB) or ZIP-ed PostScript-file (141 kB)
3. PDF-file  (298 kB) or ZIP-ed PDF-file (282 kB)
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2001 To top of the Contents page
Volume 5, No 1, Special Issue    (Only in Russian!)

Title:  In commemoration of S.A. Al'tshuler. Recollections of friends, colleagues, disciples.
e-mail:

Abstract: The collection is devoted to memory of Semjon Alexsandrovich Al'tshuler (1911-1983), eminent physicist-theorist, one of founders of the Kazan magnetic radiospectroscopy school. (Only in Russian!)

Sources:

1. Web-pages
2. Main PDF-file (1423 kB) and PDF-file of title pages with photo (262 kB)
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2004 To top of the Contents page
Volume 6, No 1, Special Issue

e-mail:

This special issue (MRSej, Volume 6, No 1) is dedicated to Professor Boris I. Kochelaev on the occasion of his seventieth birthday. The 22 papers are originally written by Kochelaev's colleagues, friends, and pupils to his anniversary, and they cover the wide range of problems of modern condensed matter physics: from polymer physics up to superconductor physics.

Sources: SubContents of this Issiue here .

Volume 6, No 2, 5 pages  (accepted: May 21, 2004).

Title: Jahn-Teller Effect of Cu2+ ions in a Zinc Selenate Hexahydrate Single Crystal
Authors: V.M. Vinokurov1, A.R. Al-Sufi1, A.E. Usachev2
Addresses: 1 Kazan State University, Kremlevskaya, 18, Kazan 420008, Russia
2 Kazan State Power-Engineering University, Kazan, Russia
e-mail: Aleksandr_Usachev@rambler.ru

Abstract: X- and Q-band studies of Cu2+ and Mn2+ doped ZnSeO4·6H2O single crystals in the temperature range of 4.2-300 K are carried out. Experimental data on EPR, spin-lattice relaxation time and optical absorption spectra are explained in the frame of the Jahn-Teller Effect of the Cu2+ ion under the low- symmetry deformation of the nearest environment of the Cu2+ ion.

PACS: 71.55; 76.30
Keywords: electron paramagnetic resonance, Jahn-Teller effect, spin-lattice relaxation time, optical absorption
Sources:

1. PDF-file  (214 kB)
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2005 To top of the Contents page
Volume 7, No 1, 6 pages  (accepted: November 10, 2005).

Title: Creation and Stability of Skyrmion State in Two-Dimensional Magnets at Doping
Authors: A.D. Ineev*, B.I. Kochelaev
Address: Kazan State University, Kremlevskaya, 18, Kazan 420008, Russia
*e-mail:

Abstract: It was shown that the hole introduced in CuO2 plane causes the creation of the skyrmion spin configuration. The stability of the skyrmion state is investigated. It was established that the critical values of the exchange interaction anisotropy and interaction between planes at which skyrmion starts to destroy, are much more than in real cuprates.

PACS: 75.10.-b;74.72.-h
Keywords: skyrmion, antiskyrmion, exchange coupling anisotropy
Sources:

1. PDF-file  (390 kB)
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2006 To top of the Contents page
Volume 8, No 1.

Pages: 1-5 (accepted: December 1, 2006)
Title: Magnetoelastic Effects and Magnetization in LiDyF4 and LiHoF4 Single Crystals
Authors: I.V. Romanova1,2,*, R.Yu. Abdulsabirov1, S.L. Korableva1, B.Z. Malkin1, I.R. Mukhamedshin1,2, H. Suzuki2, M.S. Tagirov1
Addresses: 1 Kazan State University, Kremlevskaya, 18, Kazan 420008, Russia
2 Kanazawa University, Kanazawa, 920-11, Kakuma-machi, Japan
*e-mail:

Abstract: Temperature and magnetic field dependences of the magnetization of LiHoF4 and LiDyF4 single crystals were measured with a dc-SQUID magnetometer MPSM-2 (Quantum Design) with the magnetic field applied along and perpendicular to the c axis. Experimental data are well reproduced by simulations based on the microscopic model of the crystal field and magnetoelastic interactions.

PACS: 548.0
Keywords: magnetization, magnetostriction, crystal field, LiHoF4, LiDyF4
Sources:

Pages: 6-9 (accepted: December 1, 2006)
Title: Inhibition of Water Transport Across Cell Membranes by Dimephosphon
Authors: M.V. Sundukova*, A.R. Mutina, A.I. Skorinkin
Address: Kazan State University, Kremlevskaya, 18, Kazan 420008, Russia
*e-mail:

Abstract: The inhibitory effect of widely used drug dimephosphon on water transport in human red cells at 37?C was studied in comparison to intact human erythrocytes. Intracellular water residence time characterizing water permeability of cell membrane was obtained with doping NMR technique. Inhibitory effect of dimephosphon is concentration-dependent.

Keywords: water permeability, red blood cell membrane, NMR, drug-membrane interaction
Sources:

Pages: 10-14 (accepted: December 3, 2006)
Title: Multiple Quantum NMR Dynamics in Spin Systems in Dipolar Ordered State
Authors: S.I. Doronin1, E.I. Kuznetsova1,*, E.B. Feldman1, S.D. Goren2, G.B. Furman2
Addresses: 1 Institute of Problems of Chemical Physics of RAS, Chernogolovka, 142432, Russia
2 Department of Physics, Ben Gurion University, Beer Sheva 84105, Israel
*e-mail:

Abstract: Multiple quantum (MQ) NMR dynamics in a system which was prepared initially in dipolar ordered state is investigated with analytical and numerical methods for linear open chains of nuclear spins 1/2 coupled by dipole-dipole interactions. We show that the phases of the signals of MQ coherences are shifted by p/2 with respect to the signals of the ordinary MQ NMR experiment. The sum of the intensities of MQ coherences of arbitrary opposite orders in this experiment is equal to zero. Many-spin correlations are created faster in the such experiments and can be used for investigations of many-spin dynamics of nuclear spins in solids.

PACS: 05.30.-d, 76.20.+q
Keywords: multiple quantum NMR spin dynamics, multiple quantum coherences, density matrix, high temperature approximation, dipolar ordered state
Sources:

Pages: 15-19  (accepted: December 4, 2006)
Title: Triplet state dynamics of fullerene C60 studied by pulse EPR
Authors: M.N. Uvarov1,*, L.V. Kulik1, M.A. Bizin1, V.N. Ivanova2, R.B. Zaripov3, S.A. Dzuba1
Addresses: 1 Institute of Chemical Kinetics and Combustion, 630090, Institutskaya 3, Novosibirsk,Russia
2 Institute of Inorganic Chemistry, 630090, Lavrentjev Ave. 3, Novosibirsk, Russia
3 Zavoisky Physical-Technical Institute of RAS, 420029, Sibirskii trakt 10/7, Kazan, Russia
*e-mail:

Abstract: Multiple quantum (MQ) Spin-polarized EPR spectra of fullerene C60 dissolved in glassy ortho-terphenyl was measured in the temperature range of 80 - 240K. The temperature dependence of the spectra was successfully simulated using the model of fast pseudorotation of 3C60 in a potential created by the surrounding solvent molecules. The strength of this potential was estimated at different temperatures. Near 240K this potential was found to decrease remarkably.

PACS: 33.35.+r, 33.15.Vb.
Keywords: : electron spin echo, triplet state, fullerene
Sources:

Pages: 20-23  (accepted: December 5, 2006)
Title: An EPR Monitoring of Isomerism and Coordination Sphere Dynamics in Five-Coordinated Pincer Nickel Complexes
Authors: K.A. Kozhanov*, M.P. Bubnov, V.K. Cherkasov, G.K. Fukin, N.N. Vavilina, L.Yu. Efremova, G.A. Abakumov
Address: G.A. Razuvaev Institute of Organometallic Chemistry of Russian Academy of Sciences, 603950, Tropinina str, 49, Nizhny Novgorod, Russia
*e-mail:

Abstract: A number of five-coordinated paramagnetic pincer nickel complexes have been obtained and investigated by X-band EPR spectroscopy. In general, these complexes can exist in solution as a pair of interconverting structure isomers. Activation parameters of this interconversion were estimated for several complexes.

PACS: 33.35.+r
Keywords: : electron paramagnetic resonance, o-semiquinonic complexes, pincer nickel complexes
Sources:

Pages: 24-27  (accepted: December 5, 2006)
Title: The Surface Effects Influence on Magnetic Resonance in Carbonizate
Authors: G.V. Mamin1, A.A. Rodionov1,*, M.S. Tagirov1, D.A. Tayursky1, B. Odintsov2
Addresses: 1 Kasan State University, 420008, Kremlevskaya, 18, Kasan, Russia
2 IIllinois Research EPR center, University of Illinois, Urbana, Illinois 61801,USA
*e-mail:

Abstract: The analysis of the astronium'' carbonizate powder surfaces with different particle dimensions are carried out. The behaviors of surface paramagnetic centers have been investigated by EPR method, it was established, that this behaviors depends on nature of the surfaces. The correlation of spin-lattice relaxation time of 3He nuclei and concentration of paramagnetic centers on surface of carbonizate was found

PACS: 76.30, 72.25
Keywords: : electron paramagnetic resonance, dynamic polarization, activate charcoal
Sources:

Pages: 28-32  (accepted: December 8, 2006)
Title: NMR study of quasi-1D magnetic chain in cuprates LiCu2O2 and NaCu2O2
Authors: A.A. Gippius1,2, E.N. Morozova1,2, K.S. Okhotnikov1,*, A.S. Moskvin3
Addresses: 1 Moscow State University, Faculty of Physics, Moscow 119992, Russia
2 Institute of Crystallography RAS, Moscow 117333, Russia
3 Ural State University, Ekaterinburg 620083, Russia
*e-mail:

Abstract: NMR investigation of magnetic structure and phase transitions in two isostructural quasi-one-dimensional cuprates LiCu2O2 and NaCu2O2 has been performed. While LiCu2O2 exhibits a magnetic phase transition at Tc = 24 K, NaCu2O2 orders magnetically at around 13 K. 6,7Li and 23Na NMR spectra in LiCu2O2 and NaCu2O2, respectively, provide an unambiguous experimental evidence that below Tc an incommensurate in-chain helical spin structure is established in both compounds. However, the features of the observed low temperature NMR are different pointing to different properties of the helical magnetic structure.

PACS: 76.60; 75.90
Keywords: : Nuclear magnetic resonance, quadrupole resonance, incommensurate spin
Sources:

Pages: 33-37  (accepted: December 9, 2006)
Title: Entanglement in One-Dimensional Open Chains of Spins 1/2 with XY-Hamiltonian
Authors: S.I. Doronin, E.B. Fel'dman, A.N. Pyrkov*
Address: Institute of Problems of Chemical Physics of RAS, 142432, Chernogolovka, Russia
*e-mail:

Abstract: We investigate entanglement of spin pairs in a one-dimension open chain of spins coupled by the dipole-dipole interactions (DDI) in the equilibrium state in the external magnetic field. We suggest a method of calculation of the reduced density matrix. Concurrence, the quantitative measure of the entanglement, is estimated with Wootter's criteria. Analytical and numerical methods are used in order to investigate the influence of the temperature, chain's length, distance between the spins and their distance from the chain's ends on their entanglement.

PACS: 03.65.Ud, 73.43.Nq, 05.50.+q
Keywords: : XY-Hamiltonian, magnetic resonance, reduced density matrix, quantum register, quantum computing, entanglement, qubit, addressing problem
Sources:

Pages: 38-42  (accepted: December 10, 2006)
Title: Solid-like Component in the Spin-Spin NMR-Relaxation of Heavy Oils
Authors: N.V. Shkalikov*, V.D. Skirda, R.V. Arkhipov
Address: Kazan State University, 420008, Kremlevskaya, 18, Kazan, Russia
*e-mail:

Abstract:The study of row heavy oil samples from Tatarstan and Vietnam oil wells was done by solid-echo nuclear magnetic resonance (NMR) technique on the hydrogen nuclei. For the first time in the oil study, the component with short spin-spin relaxation time (T2s = 9.8-31.2 ms) and free induction decay (FID) shape similar to a solid one was detected for all oil samples. Density \rho, "zero" viscosity \eta_0, asphaltene content and solid part PS of 1H NMR signal were measured for whole row oil samples. The correlation between the part PS of 1H NMR signal and oil density r was found for samples of Tatarstan oil, by the other hand, data for samples of Vietnam oil did not show the correlation. No correlation dependences of the part PS of 1H NMR signal and "zero" viscosity \eta_0 from asphaltene amount for whole row of oil samples were confirmed, that indicates other crystalline supramolecular structures (more probably, crystalline paraffin) existence in the oil. As a main result, the correlation between oil viscosity and the amount of the solid-like structures in it was found. The significant differences of the solid-echo signal shapes and spin-spin relaxation times of the solid-like structures were obtained for the different oil samples, that demands additional studies.

PACS: 76.60; 82.56
Keywords: : Nuclear magnetic resonance, solid-echo, heavy oils, asphaltenes
Sources:

Pages: 43-47  (accepted: December 18, 2006)
Title: Ferromagnetism in Thin Films of Germanium and Silicon Supersaturated by Manganese or Iron Impurities
Authors: D.M. Druzhnov1,*, E.S. Demidov1, Yu.A. Danilov1,2,Yu.N. Drosdov2, V.P. Lesnikov1, V.V. Podolskii1, M.V. Sapozhnikov2, S.N. Gusev1, A.I. Suchkov3
Addresses: 1 Nizhni Novgorod State University, Gagarin prospect 23, Nizhni Novgorod 603950, Russia
2 Institute for Physics of Microstructures, RAS, Nizhni Novgorod 603950, Russia
3 Institute for chemistry of high-purity substances, RAS, Nizhni Novgorod 603950, Russia

*e-mail:

Abstract: We inform an opportunity of a laser synthesis of the diluted magnetic semiconductors on the basis of germanium and silicon, doped by manganese or iron till 10-15 at. %. Thin 50-110 nanometers thickness layers Ge and Si were grown on heated up to 200-480?C monocrystal substrates of gallium arsenide or sapphire. The content of a 3d-impurity was measured by x-ray spectral method. The ferromagnetism of layers, high magnetic and acceptor activity of Mn in Ge, of Mn and Fe in Si were appeared in observation at 77-500 K of Kerr effect, abnormal Hall effect, high hole conductivity and anisotropic ferromagnetic resonance (FMR). On the FMR data the Curie point of Ge:Mn , Si:Mn on GaAs substrates and Si:Fe on Al2O3 were not lower 420, 500 and 220 K, respectively.

PACS: 75.50. Pp, 71.55.Eq, 76.50.+g, 78.20.Ls, 72.20.My
Keywords: diluted magnetic semiconductors, ferromagnetism, 3d-impurities
Sources:

Pages: 48-52  (accepted: December 22, 2006)
Title: Spin Relaxation of Electrons Localized on Shallow and Deep Donor Centers in Silicon with Different Isotopic Composition
Authors: D.V. Guseinov*, A.A. Ezhevskii
Address: Nizhni Novgorod State University, Gagarin prospect 23, Nizhni Novgorod 603950, Russia
*e-mail:

Abstract: The results of a numerical calculation of the contribution of ligand superhyperfine interactions to the line width for the phosphorus donor electron in silicon are reported and show linear behavior at lower concentrations compared to deep centers. The linear dependence for the phosphorus center in silicon predicts an electron spin-relaxation time for isotopically purified 28Si:P longer than expected on the basis of the common square-root law. The spin-lattice relaxation processes in chromium doped silicon samples enriched by 28Si isotope and with natural isotopic abundances were studied.

PACS: 76.30.Da, 71.55.Cn, 28.60.+s, 76.30.-v
Keywords: electron paramagnetic resonance, line width, hyperfine interaction, silicon, paramagnetic centers, isotopic enrichment
Sources:

2007 To top of the Contents page
Volume 9, No 1.

Pages: 1-6 (accepted: January 22, 2007)
Title: EPR of the transition metal ions in micro-plasma coatings on aluminum alloy D16
Authors: A. Sinicin, S. Borcov, V. Nadolinny*, I. Kireenko, V. Kirillov
Address: Institute of Inorganic Chemistry Siberian Branch of RAS, Novosibirsk, Russia
*e-mail:

Abstract: The influence of micro plasma oxidation (MPO) process conditions on creation of the Al2O3 coatings on aluminum alloy D16 was studied using EPR technique. Aluminum alloy D16 contains alloyed transition metals such as Cu, Mn, Fe, Ni, Ti, being incorporated into the coatings structure during MPO processes. EPR data on transition metal ions allow estimating an appearance of a high temperature phase of Al2O3 due to difference in incorporation coefficients and in the EPR parameters of transition metal ions in low and high temperature Al2O3 phases of MPO coatings. These data show that no high temperature Al2O3 phases were created during anodic MPO process.

PACS:71.55; 76.30
Keywords: electron paramagnetic resonance, transition metal ions, structure of micro plasma oxidation coatings
Sources:

1. PDF-file  (221 kB)   Top of Contents

Pages: 7-12 (accepted: January 24, 2007)
Title: Binding energy of a Cooper pairs with non-zero center of mass momentum in d-wave superconductors
Authors: M.V. Eremin, I.E. Lyubin*
Address: Kazan State University, Kremlevskaya, 18, Kazan 420008, Russia
*e-mail:

Abstract: The binding energy of Cooper pairs has been calculated for the case of d-wave symmetry of the superconducting gap in layered cuprate superconductors. We assume that Cooper pairs are formed by the short range potential and then derive the binding energy in the form \Delta _{{\mathbf{kq}}} = \Delta _x ({\mathbf{q}})\cos k_x a + \Delta _y ({\mathbf{q}})\cos k_y a + \Omega _x ({\mathbf{q}})\sin k_x a + \Omega _y ({\mathbf{q}})\sin k_y a, where q  is a total momentum of the pair. Numerical solutions of the self-consistent system of the integral equations for quantities \Delta _x ({\mathbf{q}}) , \Delta _y ({\mathbf{q}}) and \Omega _x ({\mathbf{q}}), \Omega _y ({\mathbf{q}}) along different lines in qx, qy  plane have been obtained. Anisotropy of the depairing total momentum (or depairing current) has been calculated.

Keywords: high-Tc superconductors, depairing current
Sources:

1. PDF-file  (275 kB)   Top of Content

Pages: 13-17 (accepted: January 29, 2007)
Title: Electron-acceptor Centers of Alkali Metal Modified Alumina Studied by the Anthraquinone as a Probe Molecule
Authors: M.V. Burova1,*, A.V. Fionov1, M. Bonora2, A. Lund2, V.V. Lunin1
Addresses: 1 Chemical Department, Moscow State University, Moscow, Russia
2 Department of Physics and Measurement Technology IFM, Link?ping University Link?ping, Sweden

*e-mail:

Abstract: Anthraquinone paramagnetic complexes have been used to study electron-acceptor centers on the surface of alumina modified with alkali metal ions (Li+, Na+, K+). Complexes have been characterized by CW EPR, ENDOR and pulse EPR (HYSCORE) techniques. It has been shown that alkali metal ions decreased the strength of electron-acceptor centers due to the inductive effect. As a result the concentration of anthraquinone complex with two Lewis acid sites (LAS) decreased, but the concentration of complex with one LAS increased with the increasing of alkali metal content. At large alkali metal concentration other kinds of anthraquinone paramagnetic complexes are formed, that are anthrasemiquinone weakly bound with LAS as well as anthrasemiquinone ion pair with alkali metal cation (lithium).

Keywords: EPR, ENDOR, HYSCORE, electron-acceptor centers, paramagnetic complexes of anthraquinone, alumina, aluminates
Sources:

1. PDF-file  (233 kB)   Top of Content

Volume 9, No 2.

Pages: 1-5 (accepted: December 11, 2007)
Title: Image-Potential States in Small Metal Particles
Authors: M.A. Fayzullin1,*, V.A. Zhikharev2
Addresses: 1 Kazan State University, 420008, Kremlyovskaya 18, Kazan, Russia
2 Kazan State Technological University, 420015, Karl Marks 68, Kazan, Russia

*e-mail:

Abstract: Electron states near the surface of small metal particle caused by an image charge (image-potential states) have been investigated. The wave functions were calculated and the energy spectrum of these states was found depending on particle size. To estimate the influence of static magnetic field on the image-potential states the model problem, in which electron is localized on a surface of a sphere in uniform magnetic field was solved. In this case the field dependence of the energy levels represents a complex level crossing structure.

PACS: 73.20; 73.22
Keywords: image-potential states, energy level crossing
Sources:

1. PDF-file  (169 kB)   Top of Contents

2008 To top of the Contents page
Volume 10, No 1.

Pages: 1-5 (accepted: January 25, 2008)
Title: Models of Gd3+ Paramagnetic Centers in Tetrahedral Yttrium Clusters in Cadmium Fluoride
Authors: A.V. Fokin*, V.B. Guseva, M.Yu. Artyomov
Address: Ural State University, Lenin pr., 51, Yekaterinburg 620083, Russia
*e-mail:

Abstract: Zero-field splitting parameters of Gd3+ ions localized in three types of tetrahedral clusters were estimated using the superposition approximation. The cluster structures were determined from the minimum condition of the energy of a lattice with a rare earth cluster. The monoclinic centers with b20 = -345 MHz and b20 = -600 MHz were related to [CdY2GdF26] and [Cd2YGdF26] clusters, respectively.

PACS: 76.30.-v, 76.30.Kg
Keywords: fluorite, rare earth clusters, electron paramagnetic resonance, zero-field splitting parameters, superposition approximation
Sources:

1. PDF-file  (176 kB)   Top of Contents

Pages: 6-10 (accepted: February 4, 2008)
Title: Copper NQR studies of Ag-doped ternary sulfide Cu12As4S13 (tennantite)
Authors: A.Yu. Orlova1, R.R. Gainov1,*, A.V. Dooglav1, I.N. Pen'kov2, N.N. Mozgova3
Addresses: 1 Department of Physics, Kazan State University, Kazan 420008, Russia
2 Department of Geology, Kazan State University, Kazan 420008, Russia
3 Institute of Geology and Mineralogy, Russian Academy of Science, Moscow 119017, Russia

*e-mail:

Abstract: The investigations of Ag-contaning tennantite, belonging to the group of tetrahedrite-based sulfides, were performed by means of copper nuclear quadrupole resonance (NQR) in a temperature range from 4.2 K up to 60 K. These experiments showed that copper nuclear spin-lattice relaxation rate T1-1 and nuclear spin-echo decay rate T2-1 depend on temperature in the same way as earlier studied samples with other impurity compositions. The obtained data are interpreted from the viewpoint of internal motions in the structure of tennantite. The analysis of copper NQR data at low temperatures points to magnetic phase transition near 60 K from paramagnetic phase to the phase, which resembles spin-glass-like constitution.

PACS: 76.60.Gv; 91.25.F - ; 91.60.Pn
Keywords: NQR, tennantite, tetrahedrite, magnetic phase transition
Sources:

1. PDF-file  (172 kB)   Top of Contents

Pages: 11-19 (accepted: February 21, 2008)
Title: The characterization of asphaltenes by 1H NMR relaxation method: microsecond range of spin-spin relaxation times
Authors: N.V. Shkalikov1,*, Yu.M. Ganeeva2, T.N. Yusupova2, V.D. Skirda1
Addresses: 1 Kazan State University, Kazan 420008, Russia
2 Institute of Organic and Physical Chemistry, Russian Academy of Sciences, Kazan 420088, Russia
*e-mail:

Abstract: The asphaltene powders have been studied by 1H NMR relaxation method, differential scanning calorimetry (DSC) and X-ray structure analysis. The asphaltene samples were extracted from three oils with different component and hydrocarbon-group compositions. It was found that free induction decays (FID) of various asphaltene samples contain Gaussian component with spin-spin relaxation times T2 about 10?20 μs, which was named a solid component. The detecting possibilities of equilibrium first-order phase transitions and non-equilibrium glass-transitions on temperature dependence of part Ps of solid component in the 1H NMR signal are presented. The 1H NMR relaxation and DSC methods to study temperature properties of asphaltenes are compared. The glass-transition temperatures of side aliphatic chains of asphaltene molecules are measured. We set up that crystallization of high-molecular side aliphatic chains of asphaltene molecules is possible.

PACS: 76.60.Es, 61.18.Fs, 82.56.Na, 82.56.Ub
Keywords: Nuclear magnetic resonance, solid-echo, asphaltenes, solid component
Sources:

1. PDF-file  (295 kB)   Top of Contents

Pages: 20-24 (accepted: March 11, 2008)
Title: Application of Non-Linear Approximation for Electron Paramagnetic Resonance Spectrum Analysis: Visual Spectrum Decomposer Software
Authors: A.A. Levantovsky*, A.V. Komolkin
Address: Saint Petersburg State University, Ulianovskaya st., 1, Petrodvorets, Saint Petersburg 198504, Russia
*e-mail:

Abstract: The new application of non-linear approximation for spectrum processing and multiplatform software for spectrum analysis with friendly user interface is suggested. Experimental spectrum is approximated by a sum of a number of functions. Each function can be approximated on selected interval separately when other functions are subtracted from experimental spectrum. All actions can be made using graphical user interface.

PACS: 87.80Lg, 76.30.-v
Keywords: spectrum analysis, spectrum processing, approximation, peak fitting, GUI, electron paramagnetic resonance, EPR
Sources:

1. PDF-file  (103 kB)   Top of Contents

Pages: 25-30 (accepted: April 23, 2008)
Title: Temperature Effects in the FMR spectra of Magnetic Nanoparticles Dispersed in Polymer Film and Viscous Fluid
Authors: A.L. Kovarski*, A.V. Bychkova, O.N. Sorokina, V.V. Kasparov
Address: Emanuel Institute of Biochemical Physics, RAS, Kosygin Str., 4, Moscow 119334, Russia
*e-mail:

Abstract: Temperature dependences of ferromagnetic resonance spectra of nanoparticles of magnetite dispersed in polyethylene glycol films and nickel in vaseline oil have been studied. Sharp changes in spectra position (g-value) and linewidth have been found for both systems in the temperature interval 60 - 100 K above glass transition point. These effects have not been observed for polyethylene glycol films prepared under external magnetic field. It has been shown that the effects observed are connected with formation of anisotropic aggregates from nanoparticles under magnetic field action. The main factors determining the temperature of spectra parameters changes are the matrix viscosity, particles translational mobility and spectrum sweeping time.

PACS: 82.35.Np, 76.50.+q, 78.66.Vs
Keywords: magnetite nanoparticles, nickel nanoparticles, nanoparticles dispersions, polyethylene glycol films, vaseline oil, ferromagnetic resonance, temperature effects, nanoparticles aggregation
Sources:

1. PDF-file  (217 kB)   Top of Contents

Pages: 31-38 (accepted: May 6, 2008)
Title: ESR Studies of Chemically Dehydrofluorinated Poly(vinylidene fluoride)
Authors: N.A. Mavrinskaya1*, L.A. Pesin1, M. Baumgarten2, A.V. Mavrinskiy1, E.M. Baitinger3, S.E. Evsyukov4
Addresses: 1 Chelyabinsk State Pedagogical University, Chelyabinsk 454080, Russia
2 Max-Planck-Institut fur Polymerforschung, Mainz 55128, Germany
3 NanoCompound, Baesweiler 524999, Germany
4 Evonik Technochemie GmbH, Dossenheim 69221 , Germany
*e-mail:

Abstract: X-band ESR of chemically dehydrofluorinated poly(vinylidene fluoride) films has been studied in the 150 ? 375 K temperature range. Dehydrofluorinated films reveal an ESR signal with g-factor close to that of the free electron. The ESR parameters (integral intensity, width, g-factor) of the samples depend on duration of the chemical reaction, storage conditions and temperature. Heating above 375 K modifies paramagnetic component of the samples stored in air irreversibly, probably, as a result of hydrogenous radicals desorption and/or removal of oxygen, hydroxyl groups and moisture from the samples on heating. The deviation from the Curie law has been revealed for all the investigated samples.

PACS: 76.30; 81.65
Keywords: electron spin resonance, poly(vinylidene fluoride), chemical dehydrofluorination
Sources:

1. PDF-file  (270 kB)   Top of Contents

Pages: 39-45 (accepted: May 28, 2008)
Title: 1H and 7Li NMR in Li2-xHxMO3 (M = Ti, Zr)
Author: Ya.V. Baklanova
Address: Institute of Solid State Chemistry, Yekaterinburg 620219, Russia
*e-mail:

Abstract: Nuclear magnetic resonance (NMR), Raman spectroscopy and thermogravimetric methods were used to study the peculiarities of lithium ion replacement by protons in lithium metallates Li2MO3 (M=Ti, Zr). In this article we show that almost all protons in the final substitution products H2MO3 enter into the crystal structure. All protons in zirconium hydroxide belong to hydrogen-bonded OH-groups. Contrary, titanium hydroxide contains both hydrogen-bonded and isolated OH-groups. Protons in H2ZrO3 form hydrogen bonds weaker than in H2TiO3.

PACS: 61.05.Qr, 82.56.Ub, 82.80.Gk
Keywords: nuclear magnetic resonance, hydroxide compounds, titanium dioxide, zirconium dioxide
Sources:

1. PDF-file  (313 kB)   Top of Contents

2009 To top of the Contents page

## Prof. B.I. Kochelaev (to 75th anniversary)

Volume 11, No 1.

Pages: 1-6 (accepted: July 17, 2009)
Title: The Coulomb interaction between an s-orbital electron and ionic crystal lattice
Author: O.A. Anikeenok
Address: Kazan State University, Kremlevskaya, 18, Kazan 420008, Russia
*e-mail:

Abstract: Analytical expressions for the Coulomb interaction between an s-orbital electron and the surroundings, infinite ionic crystal lattice are derived. The s-orbital wave functions are presented in the form of a Gaussian expansion. As a test, Madelung constants and interaction energy for NaCl, KMgF3, CaF2 are calculated using a single Gaussian exponent. The calculated values are coincided with known literature data with a high degree of accuracy.

PACS: 31.15.Ar, 61.44.Fw, 61.66.Fn
Keywords: localized orbitals, Madelung energy, orbital energy
Sources:

1. PDF-file  (149 kB)   Top of Contents

Pages: 7-13 (accepted: October 22, 2009)
Title: Determination of tetragonal crystalline electric field parameters for Yb3+ and Ce3+ ions from experimental g-factors values and energy levels of Kramers doublets
Authors: A.S. Kutuzov*, A.M. Skvortsova
Address: Kazan State University, Kremlevskaya, 18, Kazan 420008, Russia
*e-mail:

Abstract: The tetragonal crystalline electric field parameters for Yb3+ and Ce3+ ions are expressed via ground multiplet exited doublets energies and parameters defining doublets' wave functions. The crystalline electric field parameters for Yb3+ ion in YbRh2Si2, YbIr2Si2 and KMgF3 crystals extracted from excited state doublets energies and g-factors of ground state doublet are compared with parameters determined in other works.

PACS: 75.10.Dg, 76.30.-v, 75.20.Hr
Keywords: crystalline electric field parameters, g-factors, Yb-based intermetallides, heavy-fermion systems
Sources:

1. PDF-file  (300 kB)   Top of Contents

Pages: 14-19 (accepted: November 8, 2009)
Title: Electron-phonon interaction in the 4f125d electronic configuration of the Tm2+ ion in CaF2
Author: O.V. Solovyev*
Address: Kazan State University, Kremlevskaya, 18, Kazan 420008, Russia
*e-mail:

Abstract: The low temperature 4f13-4f125d absorption and emission band shapes of the impurity Tm2+ ions have been simulated within adiabatic approximation on the basis of a microscopic model operating with the real phonon spectrum of the host CaF2 lattice. Crystal field parameters and electron-phonon coupling constants were treated in the framework of the exchange charge model. Results of simulations of the spectral envelopes agree satisfactorily with the experimental data available from literature.

PACS: 78.20.Bh; 78.40.Ha
Keywords: 4f-5d spectra, electron-phonon interaction, CaF2
Sources:

1. PDF-file  (186 kB)   Top of Contents

Volume 11, No 2.

Pages: 20-23 (accepted: November 27, 2009)
Title: XII International School for Young Scientists «Actual problems of magnetic resonance and its applications»
Authors: M.S. Tagirov 1*, V.A. Zhikharev2
Addresses: 1 Kazan State University, Kremlevskaya, 18, Kazan 420008, Russia
2 Kazan State Technological University, Marx str., 68, Kazan 420015, Russia

*e-mail:

Sources:

Pages: 24-28 (accepted: November 27, 2009)
Title: Multiple quantum NMR of interacting equivalent spins
Authors: A.V. Fedorova*, E.B. Fel'dman
Address: Institute of Problems of Chemical Physics of RAS, N.N. Semenov av. 1, Chernogolovka 142432, Russia
*e-mail:

Abstract: A theory of multiple quantum (MQ) NMR dynamics is developed for systems of interacting equivalent spins (s=1/2). The theory can be applied for the interpretation of both MQ NMR spectra of bullvalene molecules dissolved in nematic liquid crystal solution and MQ NMR of nanopores in an external magnetic field. Numerical realization of the developed approach allows us to investigate MQ NMR dynamics in systems consisting of several hundred spins. The dependence of the MQ NMR coherence intensities on their orders (the profile of MQ coherence) is investigated in many-spin systems. It is shown that the profile is exponential in such systems. We discuss the information which can be extracted from MQ NMR spectra of systems of interacting equivalent spins.

PACS: 76.60.-k
Keywords: multiple quantum NMR, nanopores, coherences, degeneration
Sources:

Pages: 29-32 (accepted: December 14, 2009)
Title: Lorentzian form for the imaginary part of the dynamic spin susceptibility: comparison with NQR and Neutron Scattering data in copper oxide superconductors
Author: I.A. Larionov
Address: Kazan State University, Kremlevskaya, 18, Kazan 420008, Russia
*e-mail:

Abstract: We present some new results based on the relaxation function theory for a doped two-dimensional Heisenberg antiferromagnetic system with damping of paramagnon-like excitations. The Lorentzian form for the imaginary part of the dynamic spin susceptibility gives a reasonable agreement with neutron scattering and plane copper nuclear spin-lattice relaxation rate 63(1/T1) data in right up to optimally doped La2-xSrxCuO4.

PACS: 74.72.-h; 74.25.Ha; 75.40.Gb
Keywords: cuprate superconductors, dynamic spin susceptibility
Sources:

Pages: 33-37 (accepted: December 26, 2009)
Title: Inverse Laplace transform of 3He NMR relaxation data in porous media
Authors: Gazizulin R.R.*, Klochkov A.V., Kuzmin V.V., Safiullin K.R., Tagirov M.S., Yudin A.N.
Address: Kazan State University, Kremlevskaya, 18, Kazan 420008, Russia
*e-mail:

Abstract: For the first time the inverse Laplace transform was applied for analysis of 3He relaxation in porous media. It was shown that inverse Laplace transform gives new information about these systems. The uniform-penalty algorithm has been performed to obtain the 3He relaxation times distribution in pores of clay sample. It is possible to obtain pores' sizes distribution by using applicable model.

PACS: 67.30.E-; 67.30.er; 67.30.-n; 67.30.ej; 76.60.Es; 89.20.Bb.
Keywords: inverse Laplace transform, uniform-penalty algorithm, liquid 3He, pulse nuclear magnetic resonance, clay, porous media.
Sources:

2010 To top of the Contents page

Volume 12, No 1.

Pages: 1-6 (accepted: January 18, 2010)
Title: Studying the initial stages of gelation process in colloidal silica on basis of synthetic silicates by NMR microimaging and relaxometry
Authors: E.V. Morozov1,2,*, O.V. Shabanova2 , V.F. Pavlov2, O.V. Falaleev1,2
1Kirensky Institute of Physics SB RAS, Akademgorodok, 50, Krasnoyarsk 660036, Russia
2Special Designing and Technological Bureau "Nauka", Mira, 53, Krasnoyarsk 660049, Russia
*e-mail:

Abstract: The acid silicious sols obtained from synthetic silicates were investigated in this work. Using NMR microimaging it was found out the formation of considerable inhomogeneities in optically limpid samples at different stages of gel formation. They were interpreted as silicic acid polycondensation fronts. It was observed the character of spreading and fine structure of the fronts. By means of NMR relaxometry were discovered the some interesting effects at the relaxation dependences in time intervals, corresponding to gel formation transitional stages.

PACS: 76.60.Pc; 76.60.Es; 81.20.Fw
Keywords: NMR microimaging, relaxometry, colloidal silica, foamed silicate, basalt mineral wool.
Source: PDF-file (532 kB)

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Pages: 7-11 (accepted: February 1, 2010)
Title: Photoinduced EPR in KTa0.988Nb0.012O3 crystals
Authors: A.I. Gubaev1, A.A. Rodionov2, M.Kh. Salakhov2, I.N. Subacheva2,*, P.P. Syrnikov3, V.A. Trepakov3,4, Yusupov2
1Basel University, Klingelbergstr. 50-70, Basel 4056, Switzerland
2Kazan State University, Kremlevskaya, 18, Kazan 420008, Russia
3A. F. Ioffe Physical-Technical Institute, St.-Petersburg 194021, Russia
4Institute of Physics, ASCR, 182 21 Prague 8, Czech Republic
*e-mail:

Abstract: We report the first experimental observation of the photoinduced EPR spectra in KTa1-xNbxO3 crystals (x = 0.012). The signal has two components: nearly isotropic with geff = 2 and strongly anisotropic one. Isotropic signal originates most probably from single localized photo-carriers - electrons or holes. Anisotropic spectrum is observed below 10 K and reveals a set of characteristic properties. It originates from the axial centers with axes coinciding with the C4 axes of the crystal. Effective g-factor values are gparallel = 2.106(3) and gnormal < 0.8. Angle dependencies of the intensity and the width of the anisotropic signal as well as the resonance field can qualitatively be explained within the simple J = 1 model. The observed anisotropic photoinduced EPR spectrum is tentatively assigned to excitons or bipolarons.>

PACS: 71.38.Mx, 76.30.-v, 77.84.Ek.
Keywords: photoinduced electron paramagnetic resonance, potassium tantalate, KTN
Source: PDF-file (451 kB)

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Pages: 12-16 (accepted: March 19, 2010)
Title: Calculation of ZnO nanoparticle size distribution based on EPR line shape analysis
Authors: Y.S. Kutin*, G.V. Mamin, S.B. Orlinskii, N.I. Silkin
Address: Kazan State University, Kremlevskaya, 18, Kazan 420008, Russia
*e-mail:

Abstract: Quantum confinement of the shallow-donor electron wave function in ZnO nanoparticles is used to study nanocrystal samples by means of High-Frequency EPR. A method for deriving nanoparticle size distribution in the sample from the EPR line shape of the shallow donor is developed based on dependence of the shallow donor g-factor on nanoparticle size.

PACS: 73.22.-f, 76.30.Da, 61.72.uj
Keywords: ZnO, nanoparticles, shallow donor, High Frequency EPR, g-factor
Source: PDF-file (383 kB)

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Volume 12, No 2.

Pages: 17-21 (accepted: December 13, 2010)
Title: Spin dynamics and charge order-disorder phase transition detected by EPR in α'-(BEDT-TTF)2IBr2
Authors: A.I. Dmitriev*, A.S. Chernenkaya
Address: Institute of Problems of Chemical Physics Russian Academy of Sciences, Semenova, 1, Chernogolovka 142432, Russia
*e-mail:

Abstract: Stepwise changes in electron paramagnetic resonance (EPR) parameters (integral intensity, linewidth) accompanying localization of charge carriers have been found in the α'-(BEDT-TTF)2IBr2 crystals. In single crystal exchange narrowing of the EPR lines and sharp decrease in static and dynamic magnetic susceptibility caused by antiferromagnetic interaction of localized charge carriers is observed at T < 50 K. At T > 50 K a difference between static and dynamic magnetic susceptibility is observed in the α'-(BEDT-TTF)2IBr2 crystals which is due to that the frequency of thermally activated charge carrier jumps is higher than the microwave frequency of measuring field of an EPR spectrometer.

PACS: 75.50.Xx, 76.30.-v
Keywords: charge order, order-disorder, BEDT-TTF
Source: PDF-file (251 kB)

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Pages: 22-25 (accepted: December 16, 2010)
Title: EPR, structural characteristics and intramolecular movements of some phenoxyl radicals in toluene
Authors: I.R. Nizameev1,*1, M.S. Pudovkin2, M.K. Kadirov1
1A.E. Arbuzov Institute of Organic and Physical Chemistry, RAS, 420088, Arbuzov Str., 8, Kazan, Russia
2Kazan Federal University, Kremlevskaya, 18, Kazan 420008, Russia
*e-mail:

Abstract: The method of electron paramagnetic resonance (EPR) spectroscopy was used for studying magnetic and dynamic properties of phenoxyl radicals in toluene at 170-370K. Characteristics of intramolecular motion and structure of phenoxyl radicals were determined from the temperature dependence of EPR spectra. For all the given compounds the activation energies of transitions between the conformers were calculated.

PACS: 31.15.xv, 31.30.Gs, 75.20.Ck
Keywords: phenoxyl radical, phenol, conformer, EPR
Source: PDF-file (328 kB)

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2011 To top of the Contents page

Volume 13, No 1.

Pages: 1-4 (accepted: February 10, 2011)
Title: EPR investigation of nanosized silver particles in polymer composites
Authors: S.S. Khutsishvili*, T.I. Vakul'skaya, N.P. Kuznetsova, T.G. Ermakova, A.S. Pozdnyakov
Address: Favorsky Irkutsk Institute of Chemistry, SB RAS, Favorsky st., 1, Irkutsk 664033, Russia
*e-mail:

Abstract: In this work new paramagnetic composite materials based on (co)polymers of 1-vinyl-1,2,4-triazole containing silver nanoparticles were investigated and characterized. It was found that form and width of electron paramagnetic resonance (EPR) signals for silver particles of nanocomposites obtained depend on microwave power. Also the effect of temperature on intensity, g-factor and width of signal silver clusters was determined.

PACS: 82.35.Np, 76.30.-v, 75.75.-c, 75.50.Pp.
Keywords: continuous wave EPR, pulse EPR, g-factor, Ag, nanosized particles, relaxation characteristics, polymers.
Source: PDF-file (451 kB)

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Volume 13, No 2.

Pages: 5-9 (accepted: September 23, 2011)
Title: NMR study of cholesterol complexes with glycyrrhizic acid
Authors: O.Yu. Gluschenko*, N.E. Polyakov, T.V. Leshina
Address: Institute of Chemical Kinetics and Combustion, Institutskaya str., 3, Novosibirsk 630090, Russia
*e-mail:

Abstract: Nuclear magnetic resonance (NMR) relaxation technique was applied to study the interaction of cholesterol with natural complexant - glycyrrhizic acid. Stoichiometry, stability constants and thermodynamic parameters of the complex have been measured. We propose that the complexation with glycyrrhizic acid could be an effective approach to regulate the cholesterol level inside and outside of cage membranes.

PACS: 81.16.Fg, 87.64.kj, 87.80.Lg
Keywords: NMR, relaxation, cholesterol, glycyrrhizic acid, atherosclerosis, complex of cholesterol.
Source: PDF-file (196 kB)

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Pages: 10-13 (accepted: October 14, 2011)
Title: Spin probe orientation distribution functions in aligned nematic liquid crystal
Authors: T.S. Yankova*, N.A. Chumakova, D.A. Pomogailo, A.Kh. Vorobiev
Address: Department of Chemistry, Lomonosov Moscow State University,Leninskie gory, 1/3, Moscow 119991, Russia
*e-mail:

Abstract: Orientation distribution functions of nitroxide spin probe in nematic liquid crystal 5CB embedded into porous polyethylene film were determined at 295 K and at 77 K by numerical simulation of electron paramagnetic resonance (EPR) spectra. The procedure of simulation of EPR spectra at 77 K in the absence of molecular mobility of spin probe molecules allows determination of non-equilibrium orientational distribution function in supercooled liquid crystals. The suggested procedure yields an orientation distribution function of orientational axis of a spin probe molecule. Orientation distribution functions for the sample at 295 K and 77 K were found to be similar.

PACS: 76.30.-v, 61.30.Gd
Keywords: spin probe method, orientation distribution function, EPR spectra angular dependence, aligned liquid crystals, numerical simulation, spectrum fitting.
Source: PDF-file (246 kB)

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Pages: 14-20 (accepted: November 4, 2011)
Title: Temperature dependence of the conduction electron g-factor in silicon: theory and experiment
Authors: A.A. Konakov*, A.A. Ezhevskii, A.V. Soukhorukov, D.V. Guseinov, S.A. Popkov, V.A. Burdov
Address: University of Nizhniy Novgorod, Gagarin ave. 23, Nizhniy Novgorod 603950, Russia
*e-mail:

Abstract: Temperature dependence of the conduction electron Lande g-factor in silicon has been investigated both theoretically and experimentally. Theoretical consideration is based on the renormalization of the electron energy in the magnetic field by the electron-phonon interaction in the second-order perturbation theory. Interaction with lattice vibrations decreases the conduction electron g-factor. The g-factor was measured in the electron spin resonance experiments for n-Si samples. In the high temperature limit the g-factor linearly decreases with temperature in good agreement with the experimental data.

PACS: 72.25.Rb, 71.38.-k, 76.30.Pk
Keywords: g-factor, electron-phonon interaction, spin flip, renormalization, temperature dependence, conduction electron spin resonance.
Source: PDF-file (147 kB)

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Pages: 21-26 (accepted: November 25, 2011)
Title: Obtaining spatial structure of cyclosporine (CsA) in chloroform using 2D NMR
Authors: A.Y. Manin*, S.V. Efimov, V.V. Klochkov
Address: Kazan Federal University, Kremlevskaya, 18, Kazan 420008, Russia
*e-mail:

Abstract: In this work the cyclic peptide cyclosporine was investigated. Signal assignment was made according to 2D NMR spectra. Using NOESY spectra and computer simulation the spatial structure was also obtained.

PACS: 82.56.Dj, 82.56.Ub, 87.64.-t, 87.14.ef.
Keywords: high-resolution NMR, structure determination by NMR, spectroscopic techniques in biophysics and medical physics.
Source: PDF-file (454 kB)

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Pages: 27-35 (accepted: December 25, 2011)
Title: Approach to calculation of long range Coulomb interaction matrix elements in ion crystals
Author: O.A. Anikeenok
Address: Kazan Federal University, Kremlevskaya, 18, Kazan 420008, Russia
e-mail:

Abstract: Expressions for the calculation of matrix elements of the Coulomb interaction of the electron with an infinite crystal lattice in ion crystals have been obtained. In the general case, matrix elements are calculated on the orbitals belonging to ions of different sites. Gaussian type orbitals are used in the calculations. All expressions are absolutely and rather rapidly converging series in the space of the inverse lattice vectors. At present the value of this interaction being only one center is estimated by the Madelung constant, in other words, by calculating the electrostatic potential in the lattice site, i.e., in a point.

PACS: 61.50.Ah, 61.72.S
Keywords: localized orbitals, infinite crystal lattice, Madelung energy, orbital energy.
Source: PDF-file (108 kB)

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2012 To top of the Contents page

Volume 14, No 1.

Paper No. 12101 (9 pp.) (accepted: November 16, 2012)
Short reference: Magn. Reson. Solids 14, 12101 (2012)
Title: Spin-magnon relaxation of Yb3+-ions in antiferromagnetic cuprate Y1-xYbxBa2Cu3O6+y
1Kazan Federal University, Kremlevskaya, 18, Kazan 420008, Russia
2Physik-Institut der Universität Zürich, Winterhurerstrasse 190, ZH-8057, Switzerland
*e-mail:

Abstract: The spin relaxation of Yb3+-ions due to their coupling to antiferromagnetic spin waves existing in CuO2 planes in YBa2Cu3O6+y compound is reported. It is shown that it results in a strong temperature dependence of electron paramagnetic resonance (EPR) linewidth. The temperature dependence of EPR g-factor was also obtained and shows a good agreement with experimental data.

PACS: 76.30.-v, 71.27.+a, 74.72.-h
Keywords: YBCO, electron paramagnetic resonance, rare-earth ions.
Source: PDF-file (303 kB)

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Paper No. 12102 (5 pp.) (accepted: November 24, 2012)
Short reference: Magn. Reson. Solids 14, 12102 (2012)
Title: Inhomogeneous broadening of the EPR signal of Yb3+ ions in domain walls of lightly doped antiferromagnetic cuprates
Authors: A.A. Vishina1,*, A. Maisuradze2, A. Shengelaya3, B.I. Kochelaev1, H. Keller2
1Kazan Federal University, Kremlevskaya, 18, Kazan 420008, Russia
2Physik-Institut der Universität Zürich, Winterhurerstrasse 190, ZH-8057, Switzerland
3Tbilisi State University, Chavchavadze av. 3, GE-0128, Georgia
*e-mail:

Abstract: Distortion of the long-range antiferromagnetic order in the YBa2Cu3O6+y is investigated by the electron paramagnetic resonance (EPR) measurements for y=0.1-0.4. In the case of the doping level y=0.2, 0.3 the EPR signal consists of narrow and broad lines, which we relate to formation of the charged domain walls. Our theoretical analysis of the inhomogeneous EPR broadening due to the local antiferromagnetic order distortion in domain walls is well consistent with experimental results for the case of coplanar elliptical domain walls.

PACS: 76.30.-v, 71.27.+a, 74.72.-h
Keywords: YBCO, elliptical domain wall, EPR.
Source: PDF-file (405 kB)

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Paper No. 12103 (15 pp.) (accepted: December 4, 2012)
Short reference: Magn. Reson. Solids 14, 12103 (2012)
Title: Spin kinetics in Kondo lattice with heavy fermions
Authors: S.I. Belov*, A.S. Kutuzov
Address: Kazan Federal University, Kremlevskaya, 18, Kazan 420008, Russia
*e-mail:

Abstract: We investigated the spin dynamics in the heavy fermion compounds YbRh2Si2 and YbIr2Si2. The contributions of the resonant and nonresonant parts of the total transverse magnetization to the electron spin resonance (ESR) parameters are analyzed for different orientations of the static and microwave magnetic fields. It is shown that at high temperatures, when the Kondo effect is absent, the nonresonant terms may be essential in the case of the perpendicular orientation of the static magnetic field to the crystal symmetry axis. In the presence of the Kondo effect the nonresonant parts do not make a significant contribution to the ESR parameters for any configuration of the magnetic fields.

PACS: 72.15.Qm, 76.30.He, 75.30.Cr, 71.27.+a
Keywords: electron paramagnetic resonance, Kondo lattice, heavy fermions, Kondo effect, collective spin mode.
Source: PDF-file (346 kB)

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Volume 14, No 2.

Paper No. 12200 (3 pp.) (accepted: December 4, 2012)
Short reference: Magn. Reson. Solids 14, 12200 (2012)
Title: XV years of International Youth Scientific School "Actual problems of the magnetic resonance and its application"
Authors: M.S. Tagirov1,*, V.A. Zhikharev2
1Kazan Federal University, Kremlevskaya, 18, Kazan 420008, Russia
2Kazan National Research Technological University, Karl Marx street, 68, Kazan 420015, Russia
*e-mail:

Source: PDF-file (67 kB)

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Paper No. 12201 (9 pp.) (accepted: November 20, 2012)
Short reference: Magn. Reson. Solids 14, 12201 (2012)
Title: Interplay of classical and quantum spin dynamics
Author: F.S. Dzheparov
Address: Institute for Theoretical and Experimental Physics, B. Cheremushkinskaya, 25, Moscow 117218, Russia
e-mail:

Abstract: Quantum and classical spin dynamics have more similarity than difference in theoretical part. Many processes can be described within general formalism where the type of dynamics became important at final steps only. The lecture is illustrated by consideration of operator perturbation theory and multi-spin resonance transitions.

PACS: 45.10.Hj, 76.60.-k, 76.30.-v, 75.75.Jn
Keywords: spin dynamics, perturbation theory, master equation, magnetic nanoparticles, nuclear relaxation, electron relaxation, combination frequency resonance.
Source: PDF-file (134 kB)

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Paper No. 12202 (5 pp.) (accepted: November 30, 2012)
Short reference: Magn. Reson. Solids 14, 12202 (2012)
Title: NMR studies and molecular dynamics simulation of cyclosporin in complex with detergent micelles
Authors: S.V. Efimov*, V.V. Klochkov
Address: Kazan Federal University, Kremlevskaya, 18, Kazan 420008, Russia
*e-mail:

Abstract: Cyclosporin A is a highly hydrophobic peptide, but its complex with sodium dodecyl sulphate micelles can be readily dissolved in water. Nuclear magnetic resonance (NMR) investigations of cyclosporin bound to detergent micelles were carried out (including NOE spectroscopy) and yielded internuclear distances for a set of atom pairs. Based on these structural data, conformation of cyclosporin was obtained by means of molecular dynamics simulation.

PACS: 82.56.-b, 82.70.Uv, 87.14.ef, 87.15.B-.
Keywords: peptide conformation, model membrane, NOE spectroscopy, molecular dynamics simulation.
Source: PDF-file (568 kB)

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Paper No. 12203 (6 pp.) (accepted: December 15, 2012)
Short reference: Magn. Reson. Solids 14, 12203 (2012)
Title: Studies of magnetization of lithium-rare earth tetra-fluoride single crystals
Authors: I.V. Romanova 1, 2, *, A.V. Klochkov1, S.L. Korableva1, V.V. Kuzmin1, B.Z. Malkin1, I.R. Mukhamedshin1, 2, H. Suzuki2, M.S. Tagirov1
1Kazan Federal University, Kremlevskaya, 18, Kazan 420008, Russia
2Kanazawa University, Kanazawa, 920-11, Kakuma-machi, Japan
*e-mail:

Abstract: Temperature and magnetic field dependences of the magnetization of LiHoF4 and LiDyF4 single crystals were measured with a dc-SQUID magnetometer and by the inductance method with the magnetic field applied along and perpendicular to the c-axis. The results of measurements are compared with the results of simulations.

PACS: 75.30.Gw, 75.50.-y, 75.50.Dd, 75.60.Ej
Keywords: crystal field parameters, magnetization, magnetostriction, magnetoelastic interactions.
Source: PDF-file (236 kB)

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Paper No. 12204 (7 pp.) (accepted: December 12, 2012)
Short reference: Magn. Reson. Solids 14, 12204 (2012)
Title: Investigation of "cholesterol + model of biological membrane" complex by NMR spectroscopy
Authors: L.F. Galiullina*, D.S. Blokhin, A.V. Aganov, V.V. Klochkov
Address: Kazan Federal University, Kremlevskaya, 18, Kazan 420008, Russia
*e-mail:

Abstract: On the basis of the nuclear magnetic resonance (NMR) experiments it was established that molecules of sodium dodecyl sulfate can form micelles in dimethyl sulfoxide solution. The nuclear Overhauser effect between OH-group of cholesterol and "tail" groups of sodium dodecyl sulfate hydrophobic part was observed in 1D selective NOESY experiment. This observation corresponds to close spatial arrangement of these parts of different molecules and the presence of a complex between cholesterol and sodium dodecyl sulfate micelles.

PACS: 82.56.Dg, 82.56.Ub,87.64.-t, 87.15.-v.
Keywords: nuclear magnetic resonance spectroscopy, cholesterol, sodium dodecyl sulfate, micelles, nuclear Overhauser effect.
Source: PDF-file (1.32 MB)

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Paper No. 12205 (5 pp.) (accepted: December 20, 2012)
Short reference: Magn. Reson. Solids 14, 12205 (2012)
Title: Versatile coordination sphere dynamics in o-semiquinonato pincer nickel complexes: an EPR study and mechanistic aspects
Authors: K.A. Kozhanov*, M.P. Bubnov, V.K. Cherkasov, G.A. Abakumov
Address: G.A. Razuvaev institute of organometallic chemistry of RAS, Tropinina, 49, Nizhniy Novgorod, GSP 445, 603950, Russia
*e-mail:

Abstract: o-Semiquinonato pincer nickel complexes demonstrate different kinds of coordination sphere dynamics depending from the nature of the phosphorus substituents, the rigindess of the linker in the pincer fragment and the nature of the o-semiquinone.

PACS: 33.35.+r, 82.20.-w, 82.37.-j.
Keywords: EPR, spin labels, pincer complexes, o semiquinones, coordination sphere dynamics.
Source: PDF-file (1.55 MB)

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2013 To top of the Contents page

Volume 15, No 1.

Paper No. 13101 (7 pp.) (accepted: January 10, 2013)
Short reference: Magn. Reson. Solids 15, 13101 (2013)
Title: A novel data on Ag5SbS4 and CuPbSbS3 probed by antimony NQR spectroscopy
Authors: A.Yu. Orlova*, R.R. Gainov, A.V. Dooglav, I.N. Pen'kov
Address: Kazan Federal University, Kremlevskaya, 18, Kazan 420008, Russia
*e-mail:

Abstract: Investigations of Sb-based chalcogenides, stephanite Ag5SbS4 and bournonite CuPbSbS3, have been performed by 121,123Sb nuclear quadrupole resonance (NQR). In stephanite a phase transition at 140 K and internal diffusion motions with an activation energy of 0.29 eV have been experimentally detected. The analysis of experimental results for bournonite revealed two crystal-chemical positions of Sb in the unit cell with distinct local symmetry. The NQR frequencies ν and line-widths Δν data indicate that Sb(A)S3 complex has almost axial symmetry, but Sb(B)S3 complex is substantially distorted.

PACS: 76.60.Gv, 91.60.Ed, 91.60.Tn.
Keywords: NQR spectroscopy, chalcogenides, stephanite, bournonite, crystal chemistry, transport properties.
Source: PDF-file (431 kB)

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Paper No. 13102 (7 pp.) (accepted: March 23, 2013)
Short reference: Magn. Reson. Solids 15, 13102 (2013)
Title: Atherosclerotic plaque and hydroxyapatite nanostructures studied by high-frequency EPR
Authors: M.R. Gafurov1, B.V. Yavkin1, T.B. Biktagirov1, G.V. Mamin1, S.B. Orlinskii1,*, V.V. Izotov1, M.Kh. Salakhov1, E.S. Klimashina2, V.I. Putlayev2, V.A. Abdul'yanov3, I.M. Ignatjev3, R.N. Khairullin3, A.V. Zamochkin3, Yu.A. Chelyshev1,4
1Kazan Federal University, Institute of Physics, Kazan 420008, Russia
2M.V. Lomonosov Moscow State University, Department of Chemistry, Moscow 119992, Russia
3Interregional Clinic and Diagnostic Center, Kazan 420101, Russia
4Kazan State Medical University, 420012 Kazan, Russia
*e-mail:

Abstract: A series of nanosized (20 nm and larger) samples of hydroxyapatite powders synthesized by wet preparation method and doped with Mn2+ and Pb2+ ions were studied by 94 GHz pulsed electron paramagnetic resonance (EPR). The results are compared with those obtained in the samples of aorta walls from male patients with atherosclerosis as well as in bulk hydroxyapatite materials. It is shown that in contrast to bulk materials Pb ions at least partially replace the Ca(1) site in the hydroxyapatite structure. The spectral characteristics of the Mn2+ ions revealed in atherosclerotic plaque and synthetic hydroxyapatite are found to be practically identical. The hypothesis about the important role of (nano)hydroxyapatite in formation and rupture of atherosclerotic plaques is supported.

PACS: 83.80.Lz, 87.64.-t
Keywords: hydroxyapatite, nanomaterials, atherosclerotic plaque, EPR, ENDOR.
Source: PDF-file (323 kB)

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Paper No. 13103 (11 pp.) (accepted: April 9, 2013)
Short reference: Magn. Reson. Solids 15, 13103 (2013)
Title: TEMPOL as a polarizing agent for dynamic nuclear polarization of aqueous solutions
Author: M.R. Gafurov
Address: Kazan Federal University, Institute of Physics, Kremlevskaya, 18, Kazan 420008, Russia
*e-mail:

Abstract: High-resolution proton NMR (400 MHz) and multifrequency EPR (9 - 260 GHz) characterization of aqueous solutions of the nitroxyl radical TEMPOL in the temperature range (10 - 40) °C is performed for the liquid-state DNP. Characteristic features of the in-situ DNP observations at high frequencies are presented. Optimal conditions (concentration, temperature, position of the microwave pumping, repetition/build-up time for the DNP experiments) are extracted. The results are compared with the DNP experiments, molecular dynamic calculations, saturation models, and classical models of translational and rotational diffusion. Perspectives for using TEMPOL as polarizing agent in even higher magnetic fields are discussed.

PACS: 76.30.-v, 76.60.-k, 76.70.Fz
Keywords: DNP, NMR, EPR, Overhauser effect, polarizing agent, nitroxide.
Source: PDF-file (246 kB)

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Paper No. 13104 (6 pp.) (accepted: May 10, 2013)
Short reference: Magn. Reson. Solids 15, 13104 (2013)
Title: The home-built pulse nuclear magnetic resonance spectrometer with digital quadrature detection for 3He research at low temperatures
Authors: E.M. Alakshin*, R.R. Gazizulin, A.V. Klochkov, V.V. Kuzmin, A.M. Sabitova, T.R. Safin, M.S. Tagirov
Address: Kazan Federal University, Kremlevskaya, 18, Kazan 420008, Russia
*e-mail:

Abstract: The home-built pulse nuclear magnetic resonance spectrometer for 3He research is described. The temperature range is 1.5 - 4.2 K, the frequency range is 3 - 20 MHz, the dead time is 10 μs at 10 MHz. The spectrometer software is based on programming language LabVIEW. The advantages of digital technique are described; particularly the implementation of digital quadrature detector.

PACS: 75.10.Dg, 76.30.-v, 75.20
Keywords: 3He, nuclear magnetic resonance, spectrometer, low temperature, digital detection.
Source: PDF-file (486 kB)

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Volume 15, No 2.

Paper No. 13201 (9 pp.) (accepted: August 19, 2013)
Short reference: Magn. Reson. Solids 15, 13201 (2013)
Title: Specific features of electron spin resonance in quasi-1D magnet β-TeVO4
Authors: Yu. Savina1,*, A. Bludov1, V. Pashchenko1, S. Gnatchenko1, A. Stepanov2, P. Lemmens3
1B.I. Verkin Institute for Low Temperature Physics and Engineering NASU, Lenin ave., 47, Kharkiv 61103, Ukraine
2 Insitut Matériaux Microélectronique Nanosciences de Provence, CNRS UMR 6242, FST, Aix-Marseille Université, Marseille Cedex 20 F-13397, France
3Institute for Condensed Matter Physics, TU Braunschweig, Braunschweig D 38106, Germany
*e-mail:

Abstract: The angular and temperature dependences of single crystal ESR spectra at X-band frequency of quasi-1D spin 1/2 antiferromagnetic zigzag chain system β-TeVO4 are reported. Two resonance components in the ESR spectrum have been detected: a weak narrow resonance on the top of the extremely broad signal. The narrow line might be due to an impurity, the characteristics of the broad absorption do not correlate with a picture of the typical behavior for the V4+ ions (S = 1/2) with a square pyramidal environment. It was found that at low temperatures the divergence of the spin susceptibility and linewidth of the observed excitations can be due to a realization of three dimensional magnetic ordering.

PACS: 76.30. v, 76.30.Fc, 75.50.Ee, 75.10.Pq, 75.30.Gw
Keywords: electron spin resonance, antiferromagnets, spin chain systems, magnetic anisotropy, g-factors.
Source: PDF-file (391 kB)

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Paper No. 13202 (7 pp.) (accepted: August 28, 2013)
Short reference: Magn. Reson. Solids 15, 13202 (2013)
Title: Spatial structure of tetrapeptide N-AC-Ser-Phe-Val-Gly-OMe in "protein-micelle of sodium dodecyl sulfate" complex and in solid state by NMR spectroscopy
Authors: D.S. Blokhin1, S. Berger2, V.V. Klochkov1,*
1Kazan Federal University, Kremlevskaya, 18, Kazan 420008, Russia
2University of Leipzig, Augustusplatz 10, 04109 Leipzig, Germany
*e-mail:

Abstract: In the present paper the applicability of a structure determination for a four amino acid residues containing oligopeptide N-Ac-Ser-Phe-Val-Gly-OMe was investigated. The spatial structure of the "tetrapeptide (N-Ac-Ser-Phe-Val-Gly-OMe) - sodium dodecyl sulfate micelle" complex in aqueous solution was studied by 2D nuclear magnetic resonance (NMR) spectroscopy. The complexation was confirmed NOEs signs and values in the presence of sodium dodecyl sulfate. The spatial structure of the tetrapeptide in the complex was determined by 2D NOESY NMR spectroscopy. In present paper by the comparison 13C NMR chemical shifts was shown that tetra peptide's spatial structure in solid state and tetrapeptide structure in "peptide-micelle" complex are identical.

PACS: 82.56.Dj, 82.56.Ub, 87.64-t, 87.15.-v.
Keywords: oligopeptides, micelles, 2D NMR spectroscopy (TOCSY, NOESY), sodium dodecyl sulfate.
Source: PDF-file (730 kB)

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Paper No. 13203 (9 pp.) (accepted: October 8, 2013)
Short reference: Magn. Reson. Solids 15, 13203 (2013)
Title: EPR study of the CaF2 powder mechanochemical doping with rare-earth ions
Authors: I.A. Irisova*, A.A. Rodionov, D.A. Tayurskii, R.V. Yusupov
Address: Kazan Federal University, Kremlevskaya, 18, Kazan 420008, Russia
*e-mail:

Abstract: In the present work we show with electron paramagnetic resonance (EPR) spectroscopy that in the process of the mechanochemical doping of the CaF2 fine particles with Er3+ and Yb3+ ions the cubic symmetry rare-earth (RE) ion centers are formed with the concentration proportional to the particles surface in the sample. Amount of the mechano-doped RE-ion centers is proportional to ηα, where η is the weight fraction of the RE fluoride in the initial mixture and α~0.8. Cubic symmetry centers dominate in the EPR spectrum up to η=0.1. A hypothesis of the cubic RE-ion center formation is proposed according to which its origin is associated with the presence of the ideal cleavage planes in the CaF2 crystals: during the mechano-doping a considerable fraction of the rare-earth ions is trapped between the cleavage planes of the agglomerating particles, thereby getting into the crystal field of the cubic symmetry.

PACS: 73.20.Hb, 76.30.-v, 76.30.Kg
Keywords: fluorite, rare-earth ions, mechanochemical doping, electron paramagnetic resonance.
Source: PDF-file (578 kB)

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2014 To top of the Contents page

Volume 16, No 1.

Paper No. 14101 (7 pp.) (accepted: March 18, 2014)
Short reference: Magn. Reson. Solids 16, 14101 (2014)
Title: Transferred hyperfine interactions for O17: LaMnO3
Author: O.A. Anikeenok
Address: Kazan Federal University, Kremlevskaya, 18, Kazan 420008, Russia
e-mail:

Abstract: Parameters of the transferred hyperfine interactions (THFI) for O17: LaMnO3 have been estimated at room temperature. Satisfactory agreement with experiment has been obtained.

PACS: 76.70.Dx, 76.30.Kg, 71.70.Ch
Keywords: transferred hyperfine interactions, NMR, LaMnO3.
Source: PDF-file (237 kB)

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Paper No. 14102 (8 pp.) (accepted: March 29, 2014)
Short reference: Magn. Reson. Solids 16, 14102 (2014)
Title: Anisotropic exchange and effective crystal field parameters for low dimensional systems, EPR data
Author: R.M. Eremina
Zavoisky Physical-Technical Institute, Sibirskii trakt, 10/7, Kazan 420029, Russia
Kazan Federal University, Kremlevskaya, 18, Kazan 420008, Russia
e-mail:

Abstract: We review some aspects of the electron paramagnetic resonance (EPR) studies in quasi-one-dimensional inorganic compounds with special emphasis on the angular dependencies of g-factors, linewidth and the information they reveal about the physical system. In particular, we employ for the analysis of the data the method of moments and outline the expressions for the second and the fourth moments which is related to different spin-spin interactions.

PACS: 75.10.Dg, 76.30.-v, 75.20.
Keywords: anisotropic exchange interaction, EPR, crystal field parameters, low-dimensional systems.
Source: PDF-file (192 kB)

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Paper No. 14103 (7 pp.) (accepted: March 29, 2014)
Short reference: Magn. Reson. Solids 16, 14103 (2014)
Title: Scaling corrections to the static magnetic susceptibility of the heavy fermions compounds YbRh2Si2 and YbIr2Si2
Authors: S.I. Belov*, A.S. Kutuzov
Address: Kazan Federal University, Kremlevskaya 18, Kazan 420008, Russia
*e-mail:

Abstract: We theoretically investigated the static magnetic susceptibility in the heavy fermion compounds YbRh2Si2 and YbIr2Si2. The molecular field approximation together with the renormalization of the Kondo interaction by the high energy conduction electrons excitations result in the Curie Weiss law and Van Vleck susceptibility with temperature dependent Curie and Weiss parameters.

PACS: 72.15.Qm, 76.30.He, 75.30.Cr, 71.27.+a
Keywords: static magnetic susceptibility, Kondo lattice, Kondo effect.
Source: PDF-file (239 kB)

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Volume 16, No 2, SPECIAL ISSUE dedicated to Boris I. Kochelaev's 80th birthday

Paper No. 14201 (9 pp.) (accepted: April 19, 2014)
Short reference: Magn. Reson. Solids 16, 14201 (2014)
Title: Resonance dc phenomena in manganite thin films
Authors: V.A. Atsarkin*, V.V. Demidov, B.V. Sorokin
Address: V.A. Kotel’nikov Institute of Radio Engineering and Electronics of RAS 125009 Moscow
*e-mail:

Abstract: The resonance spin rectification (RSR) and resonance magnetoresistance (RMR) have been studied on La2/3Sr1/3MnO3 epitaxial thin films in the temperature range of 300-365 K, including the Curie point (TC). The RSR effect is found to be caused by anisotropic magnetoresistance under conditions of the magnetic-resonance microwave pumping; it decreases upon heating and disappears at TC. Unlike that, the RMR is maximal at TC and shows clear correlation with the colossal magnetoresistance (CMR) of the material under study. The interpretation implies decreasing of the sample magnetization due to resonance saturation, thus leading to an increase in electric resistivity in terms of the CMR mechanism. Quantitative agreement is demonstrated between the experimental RMR data and theory accounting for Bloch-type relaxation in the vicinity of the phase transition.

PACS: 76.50.+g, 75.47.Gk, 76.30.-v, 75.40.-s
Keywords: ferromagnetic resonance, rare-earth manganites, thin films, magnetoresistance, spin rectification, magnetic relaxation.
Source: PDF-file (194 kB)

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Paper No. 14202 (7 pp.) (accepted: April 19, 2014)
Short reference: Magn. Reson. Solids 16, 14202 (2014)
Title: Short-time diffusion behavior of Brownian particles in porous solids
Authors: N.F. Fatkullin1,*, R. Valiullin2
1Kazan Federal University, Kremlevskaya, 18, Kazan 420008, Russia
2University of Leipzig, Linnestraße 5, D-04103 Leipzig, Germany
*e-mail:

Abstract: The process of self-diffusion of particles confined to porous solids is studied for time intervals corresponding to particle displacements shorter than the characteristic pore size. The solid matrix is modeled as a (random) potential field with an infinitely large potential within the solid which decays to zero at distances of the order of a few particle sizes from the pore walls. Diffusion of particles in the thus created potential field is described by the Smoluchowski diffusion equation. It is shown that, for short diffusion times, the resulting equation for the time-depended diffusivity reproduces that earlier obtained in the literature [Mitra et al., Phys. Rev. Lett. 68, 3555 (1992)], but with the numerical constant differing by factor 2. The conditions under which this discrepancy arises are highlighted and discussed.

PACS: 76.30.-v, 68.65.-k
Keywords: diffusion, porous solids, short-time expansion, Smoluchowski equation.
Source: PDF-file (136 kB)

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Paper No. 14203 (19 pp.) (accepted: April 19, 2014)
Short reference: Magn. Reson. Solids 16, 14203 (2014)
Title: How to reduce reproducible measurements to an ideal experiment?
Author: R.R. Nigmatullin*, R.M. Rakhmatullin, S.I. Osokin
Address: Kazan Federal University, Kremlevskaya 18, 420008 Kazan, Russia
*e-mail:

Abstract: Is it possible to suggest a general theory for consideration of reproducible data that are measured in many experiments? One can prove that successive measurements have a memory and this important fact allows separate all data on two large classes: ideal experiments without memory and experiments with a memory. We introduce the concept of an intermediate model (IM) that helps to describe quantitatively a wide class of reproducible data. Experiments with memory require for their description the Prony’s decomposition while experiments without memory are needed for their presentation the Fourier decomposition only. In other words, it means that a measured function extracted from reproducible data can have a universal description in the form of the amplitude-frequency response (AFR) that belongs to the generalized Prony’s spectrum (GPS). It is shown also how real data distorted by the experimental equipment and how to eliminate these uncontrollable factors in order to reproduce approximately the conditions corresponding to ideal experiment. New and elegant solution of elimination of the apparatus (instrument) function is suggested. In an ideal case the decomposition coefficients belong to the Fourier transform and presentation of reproducible data in this form leads to the IM for this case. The suggested general algorithm allows considering many experiments from the unified point of view. The real example based on available electron paramagnetic resonance (EPR) data confirms this general concept. The unified “bridge” between the treated experimental data and a set of competitive hypothesis that pretend for their description is discussed. The results obtained in this paper help to put forward a new paradigm in data/signal processing.

PACS: 89.75.-k, 06.30.-k, 02.50
Keywords: Fourier transform, Prony’s decomposition, intermediate model, data/signal processing, EPR measurements with/without memory, apparatus function.
Source: PDF-file (537 kB)

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Paper No. 14204 (6 pp.) (accepted: April 19, 2014)
Short reference: Magn. Reson. Solids 16, 14204 (2014)
Title: Spin relaxation of Mn ions in rare earth manganites in paramagnetic region
Author: E.P. Sharin
Address: Kazan Federal University, Kremlevskaya 18, 420008 Kazan, Russia
e-mail:

Abstract: Within the framework of the London model the distribution of local magnetic field near the surface of plate of anisotropic type-II superconductor is found when the external magnetic field is perpendicular to the axis of symmetry of the crystal. There is obtained the distribution of the local magnetic field depending on the distance to the surface of the superconducting plate. It is shown that the lineshape of distribution of local magnetic field near the surface changes considerably as compared with the distribution in the depth of massive superconductor. This change should be taken into account when interpreting experimental data on the observation of the local magnetic field in the near-surface region of massive superconductor and in thin superconducting films (thickness is less than the depth of penetration of the magnetic field in the superconductor).

PACS: 76.30.-v, 68.65.-k
Keywords: high-temperature superconductor, magnetic field distribution, lineshape of nuclear magnetic resonance.
Source: PDF-file (249 kB)

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Paper No. 14205 (6 pp.) (accepted: April 19, 2014)
Short reference: Magn. Reson. Solids 16, 14205 (2014)
Title: Exponential temperature dependence of the Yb3+ relaxation in Y0.98Yb0.02Ba2Cu3Ox
Authors: A. Maisuradze1, A. Shengelaya2,*, E. Pomjakushina3, K. Conder3, H. Keller1, K.A. Müller1
1Physik-Institut der Universität Zürich, Winterthurerstrasse 190, CH-8057 Zürich, Switzerland
2Department of Physics, Tbilisi State University, Chavchavadze av. 3, GE-0128 Tbilisi, Georgia
3Laboratory for Developments and Methods, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland
*e-mail:

Abstract: The relaxation of Yb3+ in YBa2Cu3Ox (x = 6.1 and 6.4) was studied using Electron Paramagnetic Resonance (EPR). In these samples the Yb3+ relaxation is dominated by a phonon mechanism. It was shown that the conventional Raman two-phonon process involving acoustic phonons can not describe the temperature dependence of the Yb3+ relaxation. Instead, the Raman process involving optical phonons or an Orbach-like process via the excited vibronic levels of Cu2+ ions with energy Ω = 500(50) K is responsible for the phononic part of the Yb3+ relaxation in YBa2Cu3Ox. The present results provide clear experimental evidence that optical phonons or local vibrations are the dominant source of spin-lattice relaxation at sufficiently high temperatures, which cannot be described by the traditional approach using the Debye approximation.

PACS: 74.72.-h, 76.30.-v, 76.20.+q
Keywords: spin-lattice relaxation, optical phonons, high-temperature superconductivity.
Source: PDF-file (178 kB)

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Paper No. 14206 (21 pp.) (accepted: April 19, 2014)
Short reference: Magn. Reson. Solids 16, 14206 (2014)
Title: Spin response in HTSC cuprates: generalized RPA approach with projection operators method
Authors: M.V. Eremin1,*, I.M. Shigapov1, I.M. Eremin1,2
1Kazan Federal University, Kremlevskaya, 18, Kazan 420008, Russia
2Institut fur Theoretische Physik III, Ruhr-Universit at Bochum, D-44801 Bochum, Germany
*e-mail:

Abstract: We derive the dynamical spin susceptibility in the t-J-G model combining the random phase approximation (RPA) and projection operator method, which allows describing the mutual interplay between the local and the itinerant components of susceptibility. Near the antiferromagnetic wave vector the calculated dispersion of the spin excitations reproduces well the so-called hour-glass dispersion, characteristic for several layered cuprates. It is formed as a result of competition between the original spin-gap in magnon-like excitations spectrum and the superconducting gap, which affects the itinerant component of the susceptibility. Furthermore, the calculated collective spin excitations along (0,0)-(0,π) are in agreement with the positions of the absorption peaks in the inelastic X-ray scattering spectra. They refer to the paramagnon-like modes, characteristic to the itinerant spin system, rather than magnon-like excitations that originate from short range order effect in the system of local spins at Cu sites.

PACS: 71.27.+a, 74.72.-h
Keywords: HTSC, cuprates, dynamical spin susceptibility, collective spin excitations.
Source: PDF-file (597 kB)

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Paper No. 14207 (5 pp.) (accepted: April 19, 2014)
Short reference: Magn. Reson. Solids 16, 14207 (2014)
Title: Spin relaxation of Mn ions in rare earth manganites in paramagnetic region
Author: S.I. Andronenko
Address: Kazan Federal University, Kremlevskaya 18, 420008 Kazan, Russia
e-mail:

Abstract: Role of bottlenecked spin relaxation and proportionality between small polaron hopping conductivity and electron paramagnetic resonance (EPR) linewidth (intensity) was emphasized. This idea gave a background for several experimental and theoretical investigations and it was starting point for its further generalization on variable range hopping conductivity and its influence on EPR linewidth in rare earth manganites.

PACS: 76.30.-v, 75.47.Lx
Keywords: EPR, bottlenecked spin relaxation, rare-earth manganites.
Source: PDF-file (109 kB)

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Paper No. 14208 (14 pp.) (accepted: April 19, 2014)
Short reference: Magn. Reson. Solids 16, 14208 (2014)
Title: The peculiarities of the operation of the superconducting spin valve
Authors: I.A. Garifullin1,*, N.N. Garif’yanov1, P.V. Leksin1, A.A. Kamashev1, Ya.V. Fominov2,3, J. Schumann4, V. Kataev4, B. Büchner4,5
1Zavoisky Physical-Technical Institute, Kazan Scientific Center of Russian Academy of Sciences, 420029 Kazan, Russia
2L. D. Landau Institute for Theoretical Physics RAS, 119334 Moscow, Russia
3Moscow Institute of Physics and Technology, 141700 Dolgoprudny, Russia
4Leibniz Institute for Solid State and Materials Research IFW Dresden, D-01171 Dresden, Germany
5Institut für Festkörperphysik, Technische Universität Dresden, D-01062 Dresden, Germany
*e-mail:

Abstract: Review of our recent results concerning the spin valve effect are presented. Using the spin switch design F1/F2/S proposed theoretically that comprises a ferromagnetic bilayer (F1/F2) as a ferromagnetic component, and an ordinary superconductor (S) as the second interface component, we have realized for the first time a full spin switch effect for the superconducting current. For CoOx/Fe1/Cu/Fe2/In multilayered systems with varying Fe2-layer thickness we observed the sign-changing oscillating behavior of the spin valve effect ΔTc = TcAP - TcP  (here TcAP and TcP are the superconducting transition temperatures for antiparallel and parallel orientations of magnetizations of the F1 and F2 layers, respectively). We have also studied the angular dependence of Tc for the spin valve system CoOx/Fe1/Cu/Fe2/Pb. We found that this dependence is nonmonotonic when passing from the parallel to the antiparallel case of mutual orientation of magnetizations of the Fe1 and Fe2 layers and reveals a distinct minimum near the orthogonal configuration. The analysis of the data in the framework of the superconducting triplet spin valve theory gives direct evidence for the long-range triplet superconductivity arising due to noncollinearity of the two magnetizations.

PACS: 74.45+c, 74.25.Nf, 74.78.Fk
Keywords: superconductor, ferromagnet, proximity effect.
Source: PDF-file (1.02 MB)

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Paper No. 14209 (9 pp.) (accepted: April 19, 2014)
Short reference: Magn. Reson. Solids 16, 14209 (2014)
Title: Magnetic and superconducting heterostructures in spintronics
Authors: R.G. Deminov*, N.Kh. Useinov, L.R. Tagirov
Address: Institute of Physics, Kazan Federal University, Kremlevskaya 18, 420008 Kazan, Russia
*e-mail:

Abstract: This paper is a brief review of investigations, which were carried out during last years by team of magnetic nanostructures and spintronics laboratory, and is dedicated to the 80th anniversary of our Teacher - professor B.I. Kochelaev.

PACS: 74.45.+c, 74.50.+r, 74.78.Fk, 75.30.Et, 74.80.Fp
Keywords: magnetic, superconducting, heterostructures, spintronics.
Source: PDF-file (321 kB)

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Paper No. 14210 (10 pp.) (accepted: June 18, 2014)
Short reference: Magn. Reson. Solids 16, 14210 (2014)
Title: Probing the Metal-to-Insulator Transition in LaCu3RuxTi4-xO12 by Gd-ESR
Authors: B. Schmidt1, H.-A. Krug von Nidda1,*, S. Riegg1, S.G. Ebbinghaus2, A. Reller3, A. Loidl1
1Experimental Physics V, Center for Electronic Correlations and Magnetism, University of Augsburg, D-86159 Augsburg, Germany
2Solid State Chemistry, Martin-Luther University Halle-Wittenberg, D-06099 Halle, Germany
3Resource Strategy, University of Augsburg, D-86159 Augsburg, Germany
*e-mail:

Abstract: LaCu3RuxTi4-xO12 undergoes a metal-to-insulator transition (MIT) from a heavy-fermion metal (x = 4) with moderately enhanced electronic masses to an antiferromagnetic insulator (x = 0) with colossal dielectric constants. So far, the exact value xc of the MIT could not be obtained from electrical resistivity or specific-heat data, which are governed by local-moment scattering and Schottky anomalies, respectively. To investigate the MIT by electron spin resonance (ESR) technique, polycrystalline samples of the solid-solution series La1-yGdyCu3RuxTi4-xO12 were synthesized for the substitution range 1 ≤ x ≤ 4 and 0.05 ≤ y ≤ 0.15, where Gd3+ (8S7/2 ground state) serves as ESR probe. For x = 4 the Gd3+ ESR linewidth exhibits an enhanced Korringa relaxation at low temperatures (T<50 K) as typically expected for heavy-fermion metals. This metallic contribution gradually diminishes on decreasing Ru content x and vanishes for x = 2.25 localizing the MIT close to the onset of spin-glass behavior arising for x ≤ 2.

PACS: 71.27.+a, 71.30.+h, 76.30.-v
Keywords: heavy fermions, metal-to-insulator transition, electron spin resonance.
Source: PDF-file (1.01 MB)

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Volume 16, No 3.

Paper No. 14301 (5 pp.) (accepted: July 25, 2014)
Short reference: Magn. Reson. Solids 16, 14301 (2014)
Title: Alternative theoretical approach of the exact ferromagnetic resonance frequency for common sample shapes by considering the phenomenological damping parameter - A tribute to C. Kittel and T.L. Gilbert
Authors: K. Seemann*, H. Leiste, K. Krüger
Address: Karlsruhe Institute of Technology KIT (Campus North), Institute for Applied Materials, Hermann von Helmholtz Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
*e-mail:

Abstract: In order to establish an expression for the ferromagnetic resonance frequency of specimen with general shape, the Landau-Lifschitz-Gilbert differential equation was solved by considering demagnetisation effects and damping. By beginning the approach of calculation in a three dimensional space the sample was regarded as a uniformly magnetised ferro- or ferrimagnetic conventional ellipsoid. The condition for calculation must be a one-domain state which can be obtained by introducing a marked uniaxial anisotropy field and/or by applying an external magnetic saturation field. This can now be put on the level with a macro-spin precessing about its preferred direction. As a result, a more exact solution for the ferromagnetic resonance frequency was achieved which takes the phenomenological damping parameter as well as the demagnetisation factors into account. Applying it to certain sample shapes (plane, spherical or cylindrical) the uniaxial anisotropy field, the saturation magnetisation and especially the damping parameter show a different impact on the resonance frequency value. It could be shown that a plane sample (film) is more influenced by the damping parameter.

PACS: 75.30.Gw, 75.40.Gb, 76.20.+q, 76.50.+g
Keywords: Landau-Lifschitz-Gilbert differential equation, FMR, damping parameter, demagnetisation factors.
Source: PDF-file (122 kB)

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Paper No. 14302 (4 pp.) (accepted: August 1, 2014)
Short reference: Magn. Reson. Solids 16, 14302 (2014)
Title: Long-lived free induction decay signal in CsMnF3 single crystal
Authors: E.M. Alakshin1, Yu.M. Bunkov1,2, R.R. Gazizulin1,2, A.M. Gazizulina1, L.I. Isaenko3,4, A.V. Klochkov1, T.R. Safin1,*, K.R. Safiullin1, M.S. Tagirov1, V.N. Vedenyapin3, S.A. Zhurkov3
1Kazan Federal University, Kremlevskaya 18, 420008 Kazan, Russia
2Institut Neel, CNRS et Universite Joseph Fourier, Grenoble, France
3V.S. Sobolev Institute of geology and mineralogy, SBranch RAS, Novosibirsk, 630090, Russia
4Novosibirsk State University, 630090, Russia
*e-mail:

Abstract: Elementary excitations in antiferromagnets are magnons, and these quasiparticles with integer spin are governed by Bose statistics. In certain conditions their density can be controlled by applied radiofrequency pulse leading to the formation of Bose-Einstein condensation (BEC). We report the investigations of free induction decay signal duration in CsMnF3 under different conditions and discuss it in the framework of the magnon BEC. The observed results in CsMnF3 and previous investigations in superfluid 3He-A are compared.

PACS: 71.45.-d, 74.25.nj, 75.50.Ee
Keywords: Bose-Einstein condensation, nuclear magnetic resonance, antiferromagnets, magnons, CsMnF3.
Source: PDF-file (147 kB)

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2015 To top of the Contents page

Volume 17, No 1.

Paper No. 15101 (7 pp.) (accepted: December 11, 2015)
Short reference: Magn. Reson. Solids 17, 15101 (2015)
Title: Size-dependent concentration of N0 paramagnetic centres in HPHT nanodiamonds
Authors: B.V. Yavkin*, G.V. Mamin, M.R. Gafurov, S.B. Orlinskii
Address: Kazan Federal University, Kremlevskaya 18, Kazan 420008, Russia
*e-mail:

Abstract: Size-calibrated commercial nanodiamonds synthesized by high-pressure high-temperature (HPHT) technique were studied by high-frequency W- and conventional X-band electron paramagnetic resonance (EPR) spectroscopy. The numbers of spins in the studied samples were estimated. The core-shell model of the HPHT nanodiamonds was proposed to explain the observed dependence of the concentration of the N0 paramagnetic centers. Two other observed paramagnetic centers are attributed to the two types of structures in the nanodiamond shell.

PACS: 75.20.-g, 76.30.Mi, 81.05.ug
Keywords: diamond, nanodaimond, EPR, ESR, crystal defect.
Source: PDF-file (196 kB)

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Paper No. 15102 (5 pp.) (accepted: December 17, 2015)
Short reference: Magn. Reson. Solids 17, 15102 (2015)
Title: The method of secondary quantization in the strong bond approximation
Author: O.A. Anikeenok
Address: Kazan Federal University, Kremlevskaya 18, Kazan 420008, Russia
e-mail:

Abstract: Expressions for the calculation of the Fourier transform of the direct Coulomb interaction of electrons have been derived in the method of strong bond. It was shown that in the elaborated method it is not necessary to spread out nuclear charges over the crystal as it is done in the case of delocalized electrons.

PACS: 76 60.-k, 74 72.Dn, 74.25 Jb
Keywords: strong bond approximation, secondary quantization, NQR, NMR.
Source: PDF-file (77 kB)

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Paper No. 15103 (8 pp.) (accepted: December 19, 2015)
Short reference: Magn. Reson. Solids 17, 15103 (2015)
Title: Crystal field parameters and g-factors of the ground Kramers doublet of Ce3+ ion in LiYF4 crystal
Author: O.V. Solovyev
Address: Kazan Federal University, Kremlevskaya 18, Kazan 420008, Russia
e-mail:

Abstract: Analytical expressions are obtained for g-factors of the ground Kramers doublet of the impurity Ce3+ ions in LiYF4 crystal that rigorously take into account mixing of the 2F5/2 and 2F7/2 multiplets by crystal field. Dependence of g-factors on crystal field parameters is studied and possibilities of making conclusions about crystal filed parameters values on the basis of comparison with g-factors given in literature are considered.

PACS: 75.10.Dg, 76.30.-v
Keywords: crystal field parameters, g-factors, LiYF4:Ce3+.
Source: PDF-file (272 kB)

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Paper No. 15104 (9 pp.) (accepted: December 26, 2015)
Short reference: Magn. Reson. Solids 17, 15104 (2015)
Title: Magnetic properties and spin kinetics in Kondo lattices
Authors: S.I. Belov*, A.S. Kutuzov
Address: Kazan Federal University, Kremlevskaya 18, Kazan 420008, Russia
*e-mail:

Abstract: We present a theoretical model to describe unusual properties of Kondo lattices. The influence of the Kondo effect on the static magnetic susceptibility and electron spin resonance (ESR) parameters is studied in a simple molecular field approximation together with a scaling perturbative approach. Theoretical expressions well agree with the ESR and static magnetic susceptibility experimental data.

PACS: 72.15.Qm, 76.30.He, 75.30.Cr, 71.27.+a
Keywords: Kondo lattice, Kondo effect, ESR, static magnetic susceptibility.
Source: PDF-file (205 kB)

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Volume 17, No 2.
This issue was selected at XVIII International Youth Scientific School "Actual problems of magnetic resonance and its application", Kazan, 26 - 30 October 2015. All papers were recommended to publication in our journal and they are published after additional MRSej reviewing. The MRSej Editors, Prof. M.S. Tagirov and Prof. V.A. Zhikharev, are responsible for the issue.

Paper No. 15200 (3 pp.) (accepted: December 21, 2015)
Short reference: Magn. Reson. Solids 17, 15200 (2015)
Title: XVIII International Youth Scientific School "Actual problems of magnetic resonance and its application"
Authors: M.S. Tagirov1,*, V.A. Zhikharev2
1Kazan Federal University, Kremlevskaya 18, Kazan 420008, Russia
2Kazan National Research Technological University, Karl Marx st. 68, Kazan 420015, Russia
*e-mail:

Source: PDF-file (1.64 MB)

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Paper No. 15201 (6 pp.) (accepted: December 24, 2015)
Short reference: Magn. Reson. Solids 17, 15201 (2015)
Title: Computer simulation of growth and magnetic properties of quasi 2D magnetic cluster
Authors: N.A. Balakirev, V.A. Zhikharev*
Address: Kazan National Research Technological University, K. Marx 68, 420015 Kazan, Russia
*e-mail:

Abstract: The computer simulation of the formation of 2D magnetic cluster is performed. It is shown that the magnetic interaction between growing cluster and randomly walking atoms results in the cluster elongation in the cluster magnetization direction. The features of microwave field absorption (FMR or SPR signals) in thin granular film consisting of elongated clusters are discussed. Magnetic resonance measurements can provide the detailed information on shape anisotropy of the particles and give an evidence for considered model of magnetic cluster growth.

PACS: 75.30.Gw, 75.50.Bb,75.70.Ak
Keywords: silicide, ferromagnetic clusters, implantation, granular film, diffusion limited aggregation, ferromagnetic resonance.
Source: PDF-file (274 kB)

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Paper No. 15202 (5 pp.) (accepted: December 25, 2015)
Short reference: Magn. Reson. Solids 17, 15202 (2015)
Title: Double magnetic resonance in MnCO3
Authors: Yu.M. Bunkov1,2, A.V. Klochkov1, T.R. Safin1,*, K.R. Safiullin1,3, M.S. Tagirov1,3
1Kazan Federal University, Kremlevskaya 18, Kazan 420008, Russia
2Institut Neel, CNRS et Universite Joseph Fourier, F-38042 Grenoble, France
3Institute of Perspective Research, TAS, L.Bulachnaya 36a, 420111 Kazan, Russia
*e-mail:

Abstract: Results of experiments on MnCO3 investigations by double magnetic resonance are presented. Additional mode of oscillation has been observed in a created Bose-Einstein condensation of magnons state in MnCO3. The properties of observed signals are similar to Goldstone modes.

PACS: 71.45.-d, 74.25.nj, 75.50.Ee
Keywords: Bose-Einstein condensation, magnetic resonance, antiferromagnetics, magnons, MnCO3.
Source: PDF-file (146 KB)

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Paper No. 15203 (6 pp.) (accepted: December 23, 2015)
Short reference: Magn. Reson. Solids 17, 15203 (2015)
Title: Electron spin resonance study of the demagnetization fields of the ferromagnetic and paramagnetic films
Authors: I.I. Gimazov1,2,*, Yu.I. Talanov2
1Kazan Federal University, Kremlevskaya 18, Kazan 420008, Russia
2Zavoisky Physical-Technical Institute, Sibirsky tract 10/7, Kazan 420029, Russia
*e-mail:

Abstract: The results of the electron spin resonance study of the La1-xCaxMnO3 manganite and the diphenyl-picrylhydrazyl thin films for the magnetic field parallel and perpendicular to plane of the films are presented. The temperature dependence of the demagnetizing field is obtained. The parameters of the Curie-Weiss law are estimated for the paramagnetic thin film.

PACS: 75.30.Kz, 75.50.Dd, 75.70.-i, 76.30.Rn
Keywords: ferromagnetic resonance, electron paramagnetic resonance, thin films, free radicals, manganites.
Source: PDF-file (283 KB)

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Paper No. 15204 (8 pp.) (accepted: December 22, 2015)
Short reference: Magn. Reson. Solids 17, 15204 (2015)
Title: Electron paramagnetic resonance and quantitative color investigations of various vacuum heat treated wood species
Authors: E.I. Kondratyeva1,2,*, K.R. Safiullin1,2, I.G. Motygullin1, A.V. Klochkov1,2, M.S. Tagirov1,2, V.V. Kuzmin1
1Kazan Federal University, Kremlevskaya 18, 420008 Kazan, Russia
2Institute of Perspective Research, TAS, L.Bulachnaya 36a, Kazan 420111, Russia
*e-mail:

Abstract: The effect of the heat treatment duration on the electron paramagnetic resonance signal amplitude of free radicals for various wood species was observed. It was found that the amplitude of the electron paramagnetic resonance signal grows linearly with the vacuum heat treatment duration. The quantitative measurements of color changes for various wood species (pine, spruce, larch, birch and small-leaved lime) were performed. It is found that results of EPR experiments and color measurements of heat treated samples correlate with each other.

PACS: 76.30.-v, 07.60.Dq
Keywords: colorimetry, EPR, vacuum, thermal modification, heat treatment, wood.
Source: PDF-file (222 KB)

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Paper No. 15205 (4 pp.) (accepted: December 25, 2015)
Short reference: Magn. Reson. Solids 17, 15205 (2015)
Title: Nonlinear FMR spectra in yttrium iron garnet
Authors: Yu.M. Bunkov1,2, P.M. Vetoshko3, I.G. Motygullin1, T.R. Safin1, M.S. Tagirov1, N.A. Tukmakova1,*
1Kazan Federal University, Kremlevskaya 18, 420008 Kazan, Russia
2Institut Neel, CNRS et Universite Joseph Fourier, F-38042 Grenoble, France
3Institute of Radio Engineering and Electronics, RAS, 125009, Moscow, Russia
*e-mail:

Abstract: Results of demagnetizing effect studies in yttrium iron garnet Y3Fe5O12 thin films are reported. Experiments were performed on X-Band of electron paramagnetic resonance spectrometer at room temperature. The ferromagnetic resonance (FMR) spectra were obtained for one-layer single crystal YIG films for different values of the applied microwave power. Nonlinear FMR spectra transformation by the microwave power increasing in various directions of magnetic field sweep was observed. It is explained by the influence of the demagnetization action of nonequilibrium magnons.

PACS: 76.30.-v, 74.25.nj, 75.50.Gg
Keywords: yttrium iron garnet, EPR, magnons.
Source: PDF-file (253 KB)

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2016 To top of the Contents page

Volume 18, No 1.

Paper No. 16101 (7 pp.) (accepted: November 8, 2016)
Short reference: Magn. Reson. Solids 18, 16101 (2016)
Title: Concentration of paramagnetic centres at low-temperature thermal destruction of asphaltenes of heavy petroleum distillates
Authors: M.U. Dolomatov1,2, A.A. Rodionov3, M.R. Gafurov3,*, A.V. Petrov4, T.B. Biktagirov3, R.Z. Bakhtizin1, S.O. Makarchikov3, I.Z. Khairudinov4, S.B. Orlinskii3
1Bashkir State University, Validy 32, Ufa 450076, Russia
2Ufa State Petroleum Technological University, Kosmonavtov 1, Ufa 450000, Russia
3Kazan Federal University, Kremlevskaya 18, Kazan 420008, Russia
4Institute of Petroleum Refining and Petrochemistry, Iniciativnaya 12, Ufa 450065, Russia
*e-mail:

Abstract: Changes of paramagnetic centers (PC) concentration in dispersed petroleum systems were studied in the process of low-temperature thermolysis. The kinetic model of PC concentration dynamics based on the processes of unpaired electrons formation during singlet-triplet transitions, weak chemical bonds dissociation and recombination of free radicals is proposed.

PACS: 75.20.-g, 96.20.Dt, 02.30.Hq
Keywords: petroleum disperse system, asphalt, asphaltene, paramagnetic centers, temperature dependence, EPR, ESR.
Source: PDF-file (304 KB)

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Paper No. 16102 (5 pp.) (accepted: November 15, 2016)
Short reference: Magn. Reson. Solids 18, 16102 (2016)
Title: ENDOR study of nitrogen hyperfine and quadrupole tensors in vanadyl porphyrins of heavy crude oil
Authors: I.N. Gracheva*, M.R. Gafurov, G.V. Mamin, T.B. Biktagirov, A.A. Rodionov, A.V. Galukhin, S.B. Orlinskii
Address: Kazan Federal University, Kremlevskaya 18, Kazan 420008, Russia
*e-mail:

Abstract: We report the observation of pulsed electron-nuclear double resonance (ENDOR) spectrum caused by interactions of the nitrogen nuclei 14N with the unpaired electron of the paramagnetic vanadyl complexes VO2+ of vanadyl porphyrins in natural crude oil. We provide detailed experimental and theoretical characterization of the nitrogen hyperfine and quadrupole tensors.

PACS: 76.70.Dx, 75.10.Dg, 61.43.Bn
Keywords: crude oil, vanadyl porphyrins, ENDOR, EPR, DFT.
Source: PDF-file (405 KB)

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Paper No. 16103 (5 pp.) (accepted: November 24, 2016)
Short reference: Magn. Reson. Solids 18, 16103 (2016)
Title: Electronic and magnetic properties of [Fe(3-MeO-Qsal)2]Y•n solvent (n = 0,1) complexes
Authors: T.A. Ivanova1,*, O.A. Turanova1, L.V. Mingalieva1, I.F. Gilmutdinov2, I.V. Ovchinnikov1
1Zavoisky Physical-Technical Institute, Sibirskii trakt 10/7, Kazan 420029, Russia
2Kazan Federal University, Kremlevskaya 18, Kazan 420008, Russia
*e-mail:

Abstract: [Fe(3-MeO-Qsal)2]Y (Y = PF6, BF4, NCS, NO3, BPh4) compounds were synthesized using the diffusion method and studied by the electron spin resonance and the magnetic susceptibility methods in the temperature range (5-300) K. Coexistence of spatially separated high-spin and low-spin fractions in these compounds was observed. Low-spin fraction of all compounds reveals the antiferromagnetic correlations at low temperatures. High-spin fraction of complexes with Y = PF6 demonstrate the weak ferromagnetic properties due to exchange interaction between complexes in whole temperature range. Influence of outer-sphere anion on the spin state, the electronic properties of low-spin Fe(III) complexes is demonstrated.

PACS: 75.20-g, 75.30.Et, 76.30.-v, 75.40Cx
Keywords: high-spin and low-spin state, intermolecular interactions, outer-sphere anions.
Source: PDF-file (298 KB)

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Paper No. 16104 (5 pp.) (accepted: December 20, 2016)
Short reference: Magn. Reson. Solids 18, 16104 (2016)
Title: Paramagnetic properties and antioxidant activity of metal-containing bionanocomposites based on humic substances
Authors: N.I. Tikhonov1, S.S. Khutsishvili1,*, M.V. Lesnichaya1, G. Dolmaa2, T.I. Vakul’skaya1, G.P. Aleksandrova1, B.G. Sukhov1
1A.E. Favorsky Irkutsk Institute of Chemistry of the Siberian Branch of Russian Academy of Sciences, Favorskogo 1, Irkutsk 664033, Russia
2Chemistry and Chemical Technology Institute of the Mongolian Academy of Sciences, Enkhtaivan av. 54b, Ulaanbaatar 13330, Mongolia
*e-mail:

Abstract: Paramagnetic properties of novel bioactive nanocomposite materials based on humic substances and the precious metals (Ag, Au) are investigated by electron paramagnetic resonance and compared to their antioxidant properties. The possible mechanisms of antioxidant activity in the light of the free radical activation or inhibition of oxidation processes are analyzed.

PACS: 61.46.+w, 76.30.-v, 81.65.Mq, 87.15.-v, 81.65.Mq.
Keywords: antioxidant activity, EPR, spin density, nanocomposite, humic substance.
Source: PDF-file (327 KB)

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Volume 18, No 2.
This issue was selected at XIX International Youth Scientific School "Actual problems of magnetic resonance and its application", Kazan, 24 - 28 October 2016. All papers were recommended to publication in our journal and they are published after additional MRSej reviewing. The MRSej Editors, Prof. M.S. Tagirov and Prof. V.A. Zhikharev, are responsible for the issue.

Paper No. 16200 (2 pp.) (accepted: December 12, 2016)
Short reference: Magn. Reson. Solids 18, 16200 (2016)
Title: XIX International Youth Scientific School "Actual problems of magnetic resonance and its application"
Authors: M.S. Tagirov1,2,*, V.A. Zhikharev3
1Kazan Federal University, Kremlevskaya 18, Kazan 420008, Russia
2Institute of Perspective Researches of the Academy of Sciences of the Republic of Tatarstan, L. Bulachnaya 36a, Kazan 420111, Russia
3Kazan National Research Technological University, Karl Marx st. 68, Kazan 420015, Russia
*e-mail:

Source: PDF-file (67 KB)

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Paper No. 16201 (8 pp.) (accepted: December 17, 2016)
Short reference: Magn. Reson. Solids 18, 16201 (2016)
Title: Impurity spin in normal stochastic field: basic model of magnetic resonance
Authors: F.S. Dzheparov*, D.V. Lvov
Institute for Theoretical and Experimental Physics, B. Cheremushkinskaya 25, Moscow 117258, Russia
National Research Nuclear University “MEPhI”, Kashirskoe shosse 31, Moscow 115409, Russia
*e-mail:

Abstract: Famous Anderson-Weiss-Kubo model of magnetic resonance is reconsidered in order to bridge existing gaps in its applications for solutions of fundamental problems of spin dynamics and theory of master equations. The model considers the local field fluctuations as one-dimensional normal random process. We refined the conditions of applicability of perturbation theory to calculate the spin depolarization. It is shown that for very slow fluctuations the behavior of the longitudinal magnetization is simply related to the correlation function of the local field. The effect could be checked by the experimental studies of magnetic resonance in quasi-Ising paramagnets.

PACS: 45.10.Hj, 76.60.-k, 76.30.-v, 75.75.Jn, 05.40.-a
Keywords: magnetic resonance, spin relaxation, normal stochastic field, longitudinal correlation function, Anderson-Weiss-Kubo model.
Source: PDF-file (157 KB)

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Paper No. 16202 (6 pp.) (accepted: December 17, 2016)
Short reference: Magn. Reson. Solids 18, 16202 (2016)
Title: Dipolar relaxation of multiple-quantum NMR coherences in a linear homogeneous chain of 19F nuclei in calcium fluoroapatite
Authors: G.A. Bochkin*, E.B. Fel'dman, S.G. Vasil'ev
Address: Institute of Problems of Chemical Physics of Russian Academy of Sciences, Academician Semenov avenue 1, Chernogolovka 142432, Moscow Region, Russia
*e-mail:

Abstract: Experimental and theoretical investigations of dynamics and relaxation of multiple quantum (MQ) nuclear magnetic resonance (NMR) coherences of the zeroth and second orders are performed in a quasi-one-dimensional chain of nuclear spins of 19F in calcium fluorapatite. MQ NMR dynamics are studied on the preparation period of the MQ NMR experiment in the approximation of nearest neighbor interactions. The density matrix of the system at the end of the preparation period is used as the initial condition for the study of the relaxation process on the evolution period of the MQ NMR experiment. The relaxation asymptotics of the intensity of the MQ NMR coherence of the zeroth order is obtained. Relaxation of the MQ NMR coherence of the second order is investigated with ZZ part of the dipole-dipole interactions. The experimental data qualitatively agree with the results of the developed theory.

PACS: 03.65-w,03.67.Mn, 76.60-k
Keywords: multiple quantum NMR, multiple quantum coherence, relaxation, fermions, dipole-dipole interactions, zz-model, decoherence, coherent clusters.
Source: PDF-file (729 KB)

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Paper No. 16203 (5 pp.) (accepted: December 17, 2016)
Short reference: Magn. Reson. Solids 18, 16203 (2016)
Title: Superconducting fluctuations above critical temperature in the Bi2Sr2Ca1-xYxCu2O8 single crystals
Authors: I.I. Gimazov1,2,*, V.O. Sakhin2, Yu.I. Talanov2, T. Adachi3, T. Noji4, Y. Koike4
1Kazan Federal University, Kremlevskaya 18, Kazan 420008, Russia
2Zavoisky Physical-Technical Institute, Sibirsky tract 10/7, Kazan 420029, Russia
3Department of Engineering and Applied Sciences, Sophia University, 7-1 Kioi-cho, Chiyoda-ku, Tokyo 102-8554, Japan
4Department of Applied Physics, Tohoku University, 6-6-05 Aoba, Aramaki, Sendai 980-8579, Japan
*e-mail:

Abstract: The superconducting fluctuations above critical temperature in the Bi2Sr2Ca1-xYxCu2O8 single crystals are studied. The boundaries of the superconducting fluctuations area are defined by the MWA measurement. The estimation of the fluctuations lifetimes is made.

PACS: 74.25.Dw, 74.40.+k, 74.72.h, 52.70.Gw
Keywords: high temperature superconductors, superconducting order parameter uctuations, non-resonant microwave absorption, AC-susceptibility.
Source: PDF-file (145 KB)

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Paper No. 16204 (6 pp.) (accepted: December 17, 2016)
Short reference: Magn. Reson. Solids 18, 16204 (2016)
Title: Magnetic properties of powders LiTbF4 and TbF3
Authors: E.M. Alakshin1, A.V. Klochkov1, S.L. Korableva1, V.V. Kuzmin1, D.S. Nuzhina1,*, I.V. Romanova1, A.V. Savinkov1, M.S. Tagirov1,2
1Kazan Federal University, Kremlevskaya 18, Kazan 420008, Russia
2Institut of Perspective Research, TAS, L. Bulachnaya 36a, Kazan 420111, Russia
*e-mail:

Abstract: Samples LiTbF4 and TbF3 were synthesized by modified methods of colloidal chemistry. The magnetization of these samples was measured in the external magnetic field at 100 Oe and 1 T and in temperature range 2-300 K. Temperatures of phase transition to the magnetic ordering dipolar ferromagnet state were determined for synthesized samples.

PACS: 75.50.-y, 75.90+w, 81.10-h
Keywords: synthesis, magnetization, Curie temperature.
Source: PDF-file (425 KB)

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Paper No. 16205 (10 pp.) (accepted: December 17, 2016)
Short reference: Magn. Reson. Solids 18, 16205 (2016)
Title: Simulations of equilibrium magnetic and magnetoelastic properties of non-conducting rare-earth compounds
Authors: D.S. Nuzhina, I.V. Romanova*
Address: Kazan Federal University, Kremlevskaya 18, Kazan 420008, Russia
*e-mail:

Abstract: The Hamiltonian of the magnetic subsystem containing rare-earth ions involves energies of the localized 4f-electrons in free ions, energies of interactions of the 4f-electrons with the static crystal field in the perfect crystal lattice as well as in the homogeneously deformed lattice, interactions with the external magnetic field and lattice vibrations (electron-phonon interaction), magnetic dipolar and exchange interactions between the ions. This Hamiltonian is used in calculations of different measurable physical parameters versus temperature and the magnetic field strength and direction (energy levels of rare earth ions, the magnetization, magnetic dc- and ac-susceptibilities, elastic constants, lattice deformations).

PACS: 31.15.Ne, 75.50.-y, 75.80.+q, 76.30.Kg.
Keywords: crystalline electric field parameters, magnetostriction, magnetoelastic interaction, electron-phonon interaction.
Source: PDF-file (545 KB)

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Paper No. 16206 (5 pp.) (accepted: December 18, 2016)
Short reference: Magn. Reson. Solids 18, 16206 (2016)
Title: Study of the crystal field in CeF3 and CeF3:Pr3+
Authors: F.F. Shafikov1, A.V. Savinkov1,*, M.S. Tagirov1, 2
1Kazan Federal University, Kremlevskaya 18, Kazan 420008, Russia
2Institute of Perspective Research, TAS, L. Bulachnaya 36a, Kazan 420111, Russia
*e-mail:

Abstract: The crystal field analysis based on calculations in the framework of the semi phenomenological exchange charge model was carried out. The set of crystal field parameters for Ce3+ and Pr3+ ions in the matrix CeF3 related to the crystallographic system of coordinates has been obtained and used to reproduce satisfactory the crystal field energies of Ce3+ and Pr3+ ions.

PACS: 71.70.Ch, 71.70.Ej.
Keywords: crystal field parameters, exchange charge model, trifluorides.
Source: PDF-file (186 KB)

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Paper No. 16207 (8 pp.) (accepted: December 18, 2016)
Short reference: Magn. Reson. Solids 18, 16207 (2016)
Title: Lithium diffusion in a new cathode material Li0.8[Ni0.6Sb0.4]O2 studied by 7Li NMR
Authors: T. Salikhov1,*, E. Klysheva1, E. Zvereva2, V. Nalbandyan3, I. Shukaev3, B. Medvedev3, E. Vavilova1
1Zavoisky Physical-Technical Institute of RAS, Sibirskii trakt 10/7, Kazan 420029, Russia
2Faculty of Physics, Moscow State University, Leninskie Gory 1-2, Moscow 119991, Russia
3Chemistry Faculty, Southern Federal University, Sorge 7, Rostov-on-Don 344090, Russia
*e-mail:

Abstract: A rhombohedral layered α-NaFeO2-type compound, Lix[Ni(1+x)/3Sb(2-x)/3]O2 (x=0.8) has been prepared from the sodium analogue by ion exchange at 570 K. In contrast to the stoichiometric composition Li3Ni2SbO6, it shows considerable Li/Ni inversion and no long-range Ni/Sb ordering. The temperature dependence of the 7Li NMR spin-lattice relaxation rate and linewidth data measured at temperature range from 30-450 K show the sharp increase of lithium ions mobility comparing to the stoichiometric compound Li3Ni2SbO6. From the NMR data the activation energy was estimated by different methods.

PACS: 76.60.-k, 76.60.Es, 66.30.H-, 82.47.Aa, 82.56.Lz, 82.56.Na
Keywords: NMR, lithium, diffusion, cathode material.
Source: PDF-file (848 KB)

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Paper No. 16208 (4 pp.) (accepted: December 19, 2016)
Short reference: Magn. Reson. Solids 18, 16208 (2016)
Title: EMR searching of quantum behavior of magnetic γ-Fe2O3 nanoparticles encapsulated into poly(propylene imine) dendrimer
Authors: V.E. Vorobeva1,2, N.E. Domracheva1,*, M.S. Gruzdev3
1Zavoisky Physical Technical Institute, Sibirsky tract 10/7, Kazan 420029, Russia
2Kazan Federal University, Kremlevskaya 18, Kazan 420008, Russia
3G.A. Krestov Institute of Solution Chemistry RAS, Akademicheskaja 1, Ivanovo 153045, Russia
*e-mail:

Abstract: The superparamagnetic γ-Fe2O3 nanoparticles (average diameter of 2.5 nm) encapsulated in poly(propylene imine) dendrimer have been investigated by electron magnetic resonance (EMR). EMR measurements have been recorded in perpendicular and parallel configurations in the wide temperature range (4.2-300 K). It has been shown that the model based on the spin value S = 30, corresponding to the total magnetic moment of the nanoparticle, can be used to interpret the experimental results and the proof of the quantum behavior of γ-Fe2O3 nanoparticles.

PACS: 76.30.–v, 75.10. Dg, 61.46.+w, 75.20.-g, 96.15.Gh
Keywords: ESR/EPR, iron oxide nanoparticles, magnetism, quantum behavior, dendrimers.
Source: PDF-file (495 KB)

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Paper No. 16209 (9 pp.) (accepted: December 12, 2016)
Short reference: Magn. Reson. Solids 18, 16209 (2016)
Title: New vector/scalar Overhauser DNP magnetometers POS-4 for magnetic observatories and directional oil drilling support
Authors: V.A. Sapunov1,*, A.Y. Denisov1, D.V. Saveliev1, A.A. Soloviev2,3, S.Y. Khomutov4, P.B. Borodin5, E.D. Narkhov1, A.V. Sergeev1, A.N. Shirokov1
1Ural Federal University, Quantum Magnetometry Laboratory, Mira 21, Ekaterinburg 620002, Russia
2Geophysical Center, RAS, Molodezhnaya 3, Moscow 119296, Russia
3Schmidt Institute of Physics of the Earth, RAS, B. Gruzinskaya 10, Moscow 123242, Russia
4Institute of Cosmophysical Research and Radio Wave Propagation, FEB RAS, Mirnaya 7, Kamchatskiy Kray, Paratunka 684034, Russia
5Geophysical Observatory "Arti", Institute of Geophysics, UB RAS, Geofizicheskaya 2a, Sverdlovskaya oblast, Arti 623341, Russia
*e-mail:

Abstract: This paper covers same results of the research directed at developing an absolute vector proton magnetometer POS-4 based on the switching bias magnetic fields methods. Due to the high absolute precision and stability magnetometer POS-4 found application not only for observatories and to directional drilling support of oi and gas well. Also we discuss the some basic errors of measurements and discuss the long-term experience in the testing of magnetic observatories ART and PARATUNKA.

PACS: 75.20.-g, 76.30.Mi, 81.05.ug
Keywords: magnetometer, Overhauser dynamic nuclear polarization, nitroxide radical solution, magnetic observatory, INTERMAGNET, directional drilling.
Source: PDF-file (1.01 MB)

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Paper No. 16210 (4 pp.) (accepted: December 17, 2016)
Short reference: Magn. Reson. Solids 18, 16210 (2016)
Title: Application of Overhauser DNP and K optics INTERMAGNET quantum magnetometers to fundamental physics and cosmology
Authors: V.A. Sapunov1,*, J. Rasson2, A.V. Sergeev1, E.D. Narkhov1, A.Y. Denisov1, B.Y. Rubinstein3, A.V. Sapunov1,4
1Ural Federal University, Quantum Magnetometry Laboratory, Mira 21, Ekaterinburg 620002, Russia
2Institut Royal Météorologique Centre de Physique du Globe, Belgium
3Stowers Institute for Medical Research, USA
3Bernecker + Rainer Industrie Elektronik GmbH, Austria
*e-mail:

Abstract: This article provides suggestions and ideas on the use of magnetic observatories to observe the stability of the gyromagnetic ratio of the proton and the electron in order to detect the effects of new fundamental physics and cosmology. The idea consist in long continuous recording of the signals Overhauser and optical pumping K magnetometers. Such systems can be highly effective network for forecasting earthquakes due to highest long term sensitivity.

PACS: 75.20.-g, 76.30.Mi, 81.05.ug
Keywords: magnetometer, comagnetometer, optical pumping magnetometer, Overhauser dynamic nuclear polarization, magnetic observatory, INTERMAGNET, earthquakes forecasting, dark matter, dark energy, spin-gravity coupling.
Source: PDF-file (168 KB)

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2017 To top of the Contents page

Volume 19, No 1.

Paper No. 17101 (17 pp.) (accepted: February 3, 2017)
Short reference: Magn. Reson. Solids 19, 17101 (2017)
Title: Angular and temperature dependencies of EPR linewidth and Gorter relaxation rates in concentrated paramagnets: Application to La0.9Sr0.1MnO3 and La0.875Sr0.125MnO3
Authors: E.Kh. Khalvashi1,*, N.P. Fokina2, M.O. Elizbarashvili3
1Batumi Shota Rustaveli State University, Ninoshvili str. 35, Batumi 6010, Georgia
2Department of Science, Georgian Technical University, Kostava str. 77, Tbilisi 0175, Georgia
3Vladimir Chavchanidze Institute of Cybernetics, Georgian Technical University, Sandro Euli str. 5, Tbilisi 0186, Georgia
*e-mail:

Abstract: The angular and temperature dependencies of the electron paramagnetic resonance (EPR) linewidth in the weak constant field and of the relaxation rates measurable by the Gorter type experiments in zero constant magnetic field (Gorter RRs) are analytically investigated in magnetically concentrated paramagnets with the dominating exchange interaction. The consideration is restricted to the experiments, where the EPR linewidth is both anisotropic and linear over the temperature. It is suggested that under such conditions the EPR broadening is caused by the spin-lattice relaxation of the anisotropic interaction via the one-phonon mechanism. The analytical results are brought to the form suitable for the extraction of the Dzyaloshinsky-Moriya and the crystal field interaction constants from the experiment. It is shown that the EPR linewidth at the constant field direction along any crystal axis is equal to the half sum of the zero-field RRs for the two other crystal axes. The obtained results are successfully used for the interpretation of the EPR experimental results in the La0.9Sr0.1MnO3 and La0.875Sr0.125MnO3 single crystals in the Jahn-Teller strongly distorted phase in the definite temperature interval. The angular dependencies of the Gorter RRs and the EPR linewidth are presented graphically at the constant field continuous rotations in the three crystallographic planes in La0.9Sr0.1MnO3.

PACS: 76.30.-v, 75.30.Gw, 76.60.Es.
Keywords: EPR linewidth angular dependence, anisotropic relaxation rates, one-phonon spin-lattice relaxation.
Source: PDF-file (363 KB)

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Paper No. 17102 (11 pp.) (accepted: May 22, 2017)
Short reference: Magn. Reson. Solids 19, 17102 (2017)
Title: EPR study of hydrocarbon generation potential of organic rich domanik rocks
Authors: N.M. Khasanova1, D.T. Gabdrakhmanov1,*, G.P. Kayukova1,2, A.N. Mikhaylova2, V.P. Morozov1
1Kazan Federal University, Kremlevskaya 18, Kazan 420008, Russia
2Institute of Organic and Physical Chemistry KSC RAS, Arbuzova 8, Kazan 420088, Russia
*e-mail:

Abstract: The objects of investigation were samples of domanik formation rocks of Berezovskaya area of Romashkinskoye oil field. Content of Mn2+, SO3, SO2 ions, vanadyl-ions and free radicals has been estimated with the X-band (9.43 GHz) electron paramagnetic resonance (EPR) spectroscopy. Composition of rock and extracted from it bitumen has been studied with methods of thermal analysis, X-ray-structural analysis and gas chromatography. Significant differences in mineralogical composition and content of organic matter were revealed in samples taken from adjacent intervals. Pyrolytic experiments have been conducted to simulate kerogen maturation and petroleum generation. The increasing number of free radicals was registered in all samples after pyrolysis in a hydrogen atmosphere at 350°C. A new organic free radical C350 was registered after pyrolysis. It is suggested that domanik source rocks have not fully realized their hydrocarbon generation potential.

PACS: 76.30.-v.
Keywords: EPR spectroscopy, generation potential, kerogen, pyrolysis, domanik rocks.
Source: PDF-file (826 KB)

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Volume 19, No 2.

Paper No. 17201 (11 pp.) (accepted: November 14, 2017)
Short reference: Magn. Reson. Solids 19, 17201 (2017)
Title: Random walks in disordered lattice, CTRW, memory and dipole transport
Author: F.S. Dzheparov
National Research Center “Kurchatov Institute”, ITEP, Moscow 117258, Russia
National Research Nuclear University “MEPhI”, Moscow 115409, Russia
e-mail:

Abstract: Application of CTRW (continuous time random walks) to dipole hopping transport is reviewed. Conditions of applicability of basic kinetic equations to spin systems are indicated. Correct versions of derivation of the CTRW-equations are presented. Existence of different forms of memory kernels is demonstrated. Correction of Scher-Lax memory kernel within geometrical memory approach is fulfilled in accordance with leading terms of concentration expansion. Approximate solution for autocorrelation function is considered. Modern state of numerical simulation and experimental measurements of autocorrelation function in nuclear polarization delocalization are described. It is shown, that application of the CTRW was more successful in description of dipole transport than for hopping conductivity.

PACS: 45.10.Hj, 76.60.-k, 82.56.-b, 76.30.-v, 05.40.-a
Keywords: random walks, random media, disordered lattice, survival probability, dipole transport, hopping transport, master equation, memory kernel, projection operator, spin diffusion.
Source: PDF-file (222 KB)

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Paper No. 17202 (7 pp.) (accepted: December 5, 2017)
Short reference: Magn. Reson. Solids 19, 17202 (2017)
Title: Spectral and magnetic properties of impurity Tm3+ ions in YF3
Authors: A.V. Savinkov1,*, G.S. Shakurov2, I.E. Mumdzhi1, B.Z. Malkin1, S.I. Nikitin1, S.L. Korableva1, M.S. Tagirov1,3
1Kazan Federal University, Kremlevskaya 18, Kazan 420008, Russia
2Kazan Physical-Technical Institute, Sibirskiy trakt 10/7, Kazan 420029, Russia
3Institute of Perspective Research, TAS, L. Bulachnaya 36a, Kazan 420111, Russia
*e-mail:

Abstract: Stark structure of 3H6, 3H5, 3H4, 3F4, 3F3, 3F2 and 1G4 multiplets of impurity non-Kramers Tm3+ ions in the orthorhombic YF3 crystal has been determined from luminescence studies. High frequency electron paramagnetic resonance (EPR) spectra (~ 207 GHz) of Tm3+ ions have been measured at temperature 4.2 K in external magnetic field applied perpendicular to the b-axis of YF3:Tm3+ single crystal. The results of measurements are interpreted in the frameworks of the crystal field theory. The set of crystal field parameters related to the crystallographic system of coordinates of the YF3 lattice has been obtained and used to reproduce satisfactory the crystal field energies and the EPR spectra.

PACS: 71.70.Ch, 71.70.Ej.
Keywords: crystal field parameters, exchange charge model, EPR, trifluorides.
Source: PDF-file (323 KB)

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Paper No. 17203 (4 pp.) (accepted: December 6, 2017)
Short reference: Magn. Reson. Solids 19, 17203 (2017)
Published as Rapid Communication
Title: 89Y nuclear spin-lattice relaxation in SrY2O4:Ho3+ single crystals
Authors: A.V. Dooglav*, I.F. Gilmutdinov, V.I. Katkov, A.G. Kiiamov, I.R. Mukhamedshin
Address: Kazan Federal University, Kremlevskaya 18, Kazan 420008, Russia
*e-mail:

Abstract: Measurements of 89Y nuclear spin-lattice relaxation in SrY2O4:Ho3+ crystals for the magnetic field B parallel to the crystal c axis show that 89Y at T < 20 K relaxes due to fluctuating magnetic field created only by Ho13+ transitions between the ground and the first excited Zeeman sublevels of the 5I8 multiplet.

PACS: 76.60.-k, 67.30.er, 67.80.
Keywords: frustrated magnets, Van Vleck ions, nuclear spin-lattice relaxation.
Source: PDF-file (231 KB)

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Paper No. 17204 (5 pp.) (accepted: December 9, 2017)
Short reference: Magn. Reson. Solids 19, 17204 (2017)
Published as Rapid Communication
Title: Magnetic properties of DyF3 micro- and nanoparticles
Authors: E.M. Alakshin 1,3, E.I. Kondratyeva 1,*, D.S. Nuzhina 1, M.F. Iakovleva 1,2, I.F. Gilmutdinov 1, V.V. Kuzmin 1, K.R. Safiullin 1, A.G. Kiiamov 1, A.V. Klochkov 1,3, M.S. Tagirov 1,3
1Kazan Federal University, Kremlevskaya 18, Kazan 420008, Russia
2Leibniz Institute for Solid State and Materials Research, IFW Dresden, D-01171 Dresden, Germany
3Institute of Perspective Research, TAS, L. Bulachnaya 36a, Kazan 420111, Russia
*e-mail:

Abstract: The AC/DC magnetic susceptibility and heat capacity of microsized and nanosized DyF3 particles were measured. These measurements were used to estimate the influence of the size of DyF3 particles on their magnetic properties. Dipolar ferromagnetic transition was observed in susceptibility measurements for DyF3 microparticles at T = 2.54 K, whereas DyF3 nanosized particles remain paramagnetic down to the lowest achieved temperature of 1.8 K. This peculiar behaviour might indicate the change of magnetic properties due to crossover from macro to nanoscale physics.

PACS: 75.50.-y, 75.90+w, 81.10-h.
Keywords: magnetization, heat capacity, Curie temperature, DyF3.
Source: PDF-file (260 KB)

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Paper No. 17205 (5 pp.) (accepted: December 11, 2017)
Short reference: Magn. Reson. Solids 19, 17205 (2017)
Published as Rapid Communication
Title: Study of the crystal field and rare-earth magnetism in YF3:Yb3+
Authors: A.V. Savinkov 1,*, B.F. Gabbasov 1, O.A. Morozov 1, A.G. Kiiamov 1, M.S. Tagirov 1,2
1Institute of Physics, Kazan Federal University, Kremlevskaya 18, Kazan 420008, Russia
2Institute of Perspective Research, TAS, L. Bulachnaya 36a, Kazan 420111, Russia
*e-mail:

Abstract: The electron paramagnetic resonance spectra (X-band, f ~ 9.42 GHz) of Yb3+ ions have been measured at temperature 15 K in YF3:Yb3+ single crystals. The principal values of the g-tensors, gb = g1 = 1.67, g2 = 2.42, g3 = 5.41, and directions n1 = [0, 1, 0], n2 = [±sin(54.8°), 0, cos(54.8°)], n3 = [∓sin(35.2°), 0, cos(35.2°)] of the corresponding principal axes for the Yb3+ ions which replace Y3+ ions at two magnetically nonequivalent sites with the local Cs symmetry in the orthorhombic crystal lattice have been obtained from analysis of the angular dependences of the spectra taken in the static magnetic fields lying in the crystallographic (bc) and (ac) planes. Experimental data are interpreted in the frameworks of the crystal field theory. Using the obtained set of crystal field parameters for Yb3+ ions in the YF3 host related to the crystallographic system of coordinates, we can reproduce satisfactorily the crystal field energies of Yb3+ ions determined earlier from optical measurements.

PACS: 71.70.Ch, 71.70.Ej.
Keywords: crystal field parameters, exchange charge model, EPR, trifluorides.
Source: PDF-file (300 KB)

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Paper No. 17206 (4 pp.) (accepted: December 13, 2017)
Short reference: Magn. Reson. Solids 19, 17206 (2017)
Published as Rapid Communication
Title: Superhyperfine interactions in Ce3+ doped LiYF4 crystal: ENDOR measurements
Authors: M.R. Gafurov*, G.V. Mamin, I.N. Kurkin, A.A. Rodionov, S.B. Orlinskii
Address: Kazan Federal University, Kremlevskaya 18, Kazan 420008, Russia
*e-mail:

Abstract: The first observation of the resolved Mims electron-nuclear double resonance (ENDOR) spectra from the nearby and remote nuclei of 19F and 7Li nuclei on impurity Ce3+ ions in LiYF4 crystal is reported. It shows that LiYF4:Ce3+ system can be exploited as a convenient matrix for performing spin manipulations and adjusting quantum computation protocols while ENDOR technique could be used for the investigation of electron-nuclear interaction with all the nuclei of the system and exploited for the electron-nuclear spin manipulations.

PACS: 76.70.Dx, 75.10.Dg, 61.43.Bn.
Keywords: crystal, fluoride, rare earth, ENDOR, EPR.
Source: PDF-file (193 KB)

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Paper No. 17207 (10 pp.) (accepted: December 17, 2017; published December 27, 2017)
Short reference: Magn. Reson. Solids 19, 17207 (2017)
Title: Conventional electron paramagnetic resonance for studying synthetic calcium phosphates with metal impurities (Mn2+, Cu2+, Fe3+)
Authors: F. Murzakhanov1, B. Gabbasov1, K. Iskhakova1, A. Voloshin1, G. Mamin1, V. Putlyaev2, E. Klimashina2, I. Fadeeva3, A. Fomin3, S. Barinov3, T. Biktagirov1,4, S. Orlinskii1, M. Gafurov1,*
1Kazan Federal University, Kremlevskaya 18, Kazan 420008, Russia
2Lomonosov Moscow State University, GSP-1, Leninskie Gory, Moscow, Russia
3Baikov Institute of Metallurgy and Materials Science, Leninskii Pr. 49, Moscow, Russia
*e-mail:

Abstract: Calcium phosphate (CaP) based materials are widely recognized as the most suitable matrix for bone tissue engineering. The cationic and anionic substitution of CaP structure by the elements and groups of biological importance is the effective way to improve the properties of CaP based substances to achieve the material’s desired parameters. Some aspects of application of the conventional electron paramagnetic resonance (EPR) approaches for characterization of CaP powders and ceramics such as hydroxyapatite (HAp) and tricalcium phosphates (TCP) containing intrinsic impurities or intentional dopants like manganese, copper, iron are demonstrated. It is shown that the radiation induced EPR spectra for the nominally pure HAp and TCP reveal the presence of stable nitrogen containing or hydrogen radicals and depend on the CaP synthesis route. It is found that the experimental values of the hyperfine splitting (A) for the nitrogen containing radicals in TCP differ from those known for HAp. The observed narrowing of the central EPR line and increase of its amplitude with the concentration of Mn2+ in the range from 0.05 up to 5 wt. % could be exploited for the quantitative determination of manganese in CaP. Analysis of the EPR spectra of the iron containing CaP allows to determine the presence of iron in Fe3+ state. The values of the components of g and A for Cu2+ ions in TCP are determined and it is demonstrated that they can be influenced by the presence of the codoped Mn2+. Therefore, conventional EPR can be used to study cation-cation codoping.

PACS: 83.80.Lz, 87.64.-t.
Keywords: hydroxyapatite, calcium phosphates, tricalciumphosphate, ENDOR, EPR.
Source: PDF-file (401 KB)

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Paper No. 17208 (10 pp.) (accepted: December 24, 2017; published December 28, 2017)
Short reference: Magn. Reson. Solids 19, 17208 (2017)
Title: Calculation of g-tensor of rare-earth ions with account of isotropic reduction of orbital momentum
Authors: A.S. Dudalov, O.V. Solovyev*
Address: Kazan Federal University, Kremlevskaya 18, Kazan 420008, Russia
*e-mail:

Abstract: g-tensor components for a Kramers doublet of an impurity ion doped into dielectric crystal are expressed through coefficients of expansion of the doublet wavefunctions in the basis of full momentum of the impurity ion taking into account isotropic reduction of orbital momentum in Zeeman energy due to covalence. Mixing of terms and multiplets of the impurity ion is considered rigorously in the expansion of doublet wavefunctions. The obtained expressions can be useful in calculations and analysis of g-factors dependence on the impurity ion Hamiltonian parameters. The derived formulas are applied to calculation of g-factors of the ground Kramers doublet of Ce3+ ion doped in LiYF4 crystal. It is shown that considering reduction of orbital momentum of the 4f electron of the Ce3+ ion in Zeeman energy can significantly improve agreement with experimentally measured g-factors for this compound, available in literature.

PACS: 75.10.Dg, 76.30.-v.
Keywords: g-factors, orbital momentum reduction, LiYF4:Ce3+.
Source: PDF-file (227 KB)

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Paper No. 17209 (9 pp.) (accepted: December 26, 2017; published December 30, 2017)
Short reference: Magn. Reson. Solids 19, 17209 (2017)
Title: Electron paramagnetic resonance and X-ray diffraction study of PbF2 fine powders mechanochemically doped with Er3+ ions
Authors: I.A. Irisova1,*, I.N. Gracheva1, Y.V. Lysogorskiy1, A.A. Shinkarev2, A.A. Rodionov1, D.A. Tayurskii1, R.V. Yusupov1
1Kazan Federal University, Kremlevskaya 18, Kazan 420008, Russia
2Kazan National Research Technological University, K. Marx str. 68, 420015 Kazan, Russia
*e-mail:

Abstract: Investigation of the mechanochemical doping of PbF2 powders with Er3+ ions with electron paramagnetic resonance and X-ray diffraction is presented. In the analysis of the results a possibility of the structural transformation between the cubic β-PbF2 and orthorhombic α-PbF2 phases in the course of synthesis was taken into account. It is shown that regardless of the initial state of PbF2 it reveals high efficiency of the mechanochemical doping with Er3+ ions. Obtained particles are found in (α/β)-PbF2 structurally inhomogeneous state with the majority of the Er3+ ions located in the equilibrium α-PbF2 fraction. Preferrable location of the Er3+ ions in the α-PbF2 phase is related to the fact that the formation of the cation vacancies necessary for a mechanically activated diffusion of erbium ions into the particles and nucleation of the α-PbF2 phase proceed in parallel and is mediated by dislocations created in the course of synthesis. Annealing of the sample leads to a conversion of its entire volume into the metastable β-PbF2 phase with all the Er3+ centers possessing the cubic symmetry.

PACS: 73.20.Hb, 76.30.-v, 76.30.Kg.
Keywords: fluorite, rare-earth ions, mechanically activated doping, electron paramagnetic resonance.
Source: PDF-file (1.06 MB)

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2018 To top of the Contents page

Volume 20, No 1.

Paper No. 18101 (8 pp.) (accepted March 19, 2018; published March 30, 2018)
Short reference: Magn. Reson. Solids 20, 18101 (2018)
Title: EPR of the V4+ ion in single crystals of pyrovanadates β-Mg2V2O7, α-Zn2V2O7: Spin-Hamiltonian parameters
Authors: S.K. Misra1, S.I. Andronenko2,*
1Concordia University, 1455 de Maisonneuve Blvd West, Montreal, Quebec, H3G 1M8, Canada
2Kazan Federal University, Kremlevskaya 18, Kazan 420008, Russia
*e-mail:

Abstract: The angular variation of V4+ electron paramagnetic resonance (EPR) line positions were recorded in single crystals of β-Mg2V2O7 and α-Zn2V2O7 at 120 K and 295 K in three mutually perpendicular planes in the temperature range from 120 to 295 K and at some intermediate temperatures. Least-squares fitting was used by diagonalization of the Spin-Hamiltonian (SH) matrix to determine the SH parameters and the orientations of the principal axes of the g- and A-matrices from the angular variations of the EPR line positions. Although the V4+ SH parameters were found to be similar in the two crystals, the orientations of the principal axes of the g- and A-matrices were not found to be coincident in the two crystals.

PACS: 75.10.Dg, 76.30.-v, 75.20.
Keywords: V4+ ion, Spin-Hamiltonian parameters, g-matrix, A-matrix, EPR, pyrovanadates.
Source: PDF-file (515 KB)

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Paper No. 18102 (9 pp.) (accepted March 19, 2018; published April 4, 2018)
Short reference: Magn. Reson. Solids 20, 18102 (2018)
Title: Investigation of molecular mobility and exchange of n-hexane and water in silicalite-1 by 2D 1H NMR relaxometry
Authors: B.I. Gizatullin1,2, A.V. Savinkov1,*, T.V. Shipunov1, D.L. Melnikova1, M.M. Doroginitzky1, V.D. Skirda1
1Kazan Federal University, Kremlevskaya 18, Kazan 420008, Russia
2Ilmenau Technical University, Unterpoerlitzer 38, Ilmenau 98693, Germany
*e-mail:

Abstract: Molecular mobility and exchange of adsorbed fluid in porous media of silicalite-1 were studied by two-dimensional nuclear magnetic resonance (NMR) techniques in fully and partly saturated samples. Three porous volumes were determined in silicalite-1 where n-hexane and water molecules are adsorbed: intracrystallite channels, mesopores and intercrystallite space. The molecular exchange between all porous volumes was observed and typical exchange times were estimated for n-hexane and water. Using the exchange times the self-diffusion coefficients were estimated as D ~ 1.11×10−10 for n-hexane and D ~ 6.67×10−11 m2/s for water in fully saturated silicalite-1 and found in a good agreement with literature data.

PACS: 76.60.Es, 76.60.-k, 76.70.-r, 75.78.-n.
Keywords: Nuclear magnetic resonance, silicalite-1, molecular exchange, T1-T2 and T2-T2 correlations.
Source: PDF-file (417 KB)

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Paper No. 18103 (7 pp.) (accepted April 7, 2018; published April 15, 2018)
Short reference: Magn. Reson. Solids 20, 18103 (2018)
Title: Disorder effect and the vortex phase transition in layered organic superconductor κ-(BEDT-TTF)2Cu[N(CN)2]Br
Authors: H. El Ouaddi1,*, A. Tirbiyine1, A. Taoufik1, Y. Ait Ahmed1, A. Hafid1, M. Mamor2, H. Chaib3, A. Nafidi3, S. Snoussi4
1E.M.S, Research Laboratory, Faculty of Science, University Ibn Zoh, Agadir, Morocco
3L.P.M.C.N.E.R, Research Laboratory, Faculty of Science, University Ibn Zoh, Agadir, Morocco
4Laboratoire de Physique des Solides, UMR 8502, Université Paris-Sud, Bat.510, 91405 Orsay, France
*e-mail:

Abstract: We report systematic detailed measurement of the superconducting properties on the layered organic superconductor κ-(BEDT-TTF)2Cu[N(CN)2]Br near 80 K and the effect of disorder on the superconducting transition temperature Tc. The reversible part of the magnetization (reversible magnetization) and the magnetic entropy change (ΔS) were studied. Using the London model, we determine the temperature dependence of the London penetration depth (λ) from the slope of the linear M(lnH) dependence of the isothermal magnetization. Our results show the strong dependence of ΔS and λ on the temperature. The structural transformation which occurs at the vicinity of 80 K very strongly influences the physics of vortex lattice and the associated magnetic behavior.

PACS: 74.25.Ha, 74.25.Sv, 74.70.Kn. 75.60.Ej.
Keywords: Organic superconductor, reversible magnetization, magnetic entropy change, vortex pinning, London penetration depth.
Source: PDF-file (285 KB)

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Paper No. 18104 (8 pp.) (accepted May 10, 2018; published May 23, 2018)
Short reference: Magn. Reson. Solids 20, 18104 (2018)
Title: Degenerated nuclear magnetostatic modes in ferromagnets
Authors: M.A. Borich1,2,* S.P. Savchenko1, A.P. Tankeyev1,2
1Institute of Metal Physics of Ural Branch of RAS, S. Kovalevskoy 18, Ekaterinburg 620108, Russia
2Ural Federal University, Mira 19, Ekaterinburg 620002, Russia
*e-mail:

Abstract: The detailed calculations of dependence of the frequency of oscillations on the external magnetic field and on the shape of ferromagnet sample with interacting electronic and nuclear subsystems were done. Such system possesses a discrete number of eigenfrequencies of precession of magnetization. It is shown that these magnetostatic eigenmodes can be degenerated, i.e. different modes can have the same frequency. The dependence of these degenerated modes on the sample shape is investigated. It is shown that the properties of magnetization precession and even the number of eigenmodes depend on the external magnetic field and on the shape of the sample. These effects may produce specific features on the NMR spectra of magnetic materials.

PACS: 76.60.-k, 75.78.-n.
Keywords: Electron-nuclear interaction, magnetostatic boundary conditions, NMR.
Source: PDF-file (324 KB)

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Paper No. 18105 (8 pp.) (accepted May 28, 2018; published June 4, 2018)
Short reference: Magn. Reson. Solids 20, 18105 (2018)
Title: Calculation of the matrix elements of the long-range Coulomb interaction in low-symmetry crystals
Author: O.A. Anikeenok
Address: Kazan Federal University, Kremlevskaya 18, Kazan 420008, Russia
e-mail:

Abstract: The expressions for calculating the matrix elements of the Coulomb interaction between an electron and a low-symmetry infinite crystal lattice have been obtained. One-center matrix elements are considered. The Gaussian type of orbitals (GTO) is used in calculations. All expressions are absolutely and rapidly converging series in the space of reciprocal lattice vectors.

PACS: 61.50.Ah, 61.72.S.
Keywords: localized orbitals, infinite crystal lattice, Madelung energy, orbital energy.
Source: PDF-file (285 kB)

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Volume 20, No 2.

Paper No. 18201 (9 pp.) (accepted September 10, 2018; published September 18, 2018)
Short reference: Magn. Reson. Solids 20, 18201 (2018)
Title: Experimental evidences of the shape-induced structural distortion of SrTiO3 single crystals from impurity Mn4+ ions electron paramagnetic resonance
Authors: B.F. Gabbasov1, I.N. Gracheva1, S.I. Nikitin1, D.G. Zverev1, A. Dejneka2, V.A. Trepakov2,3, R.V. Yusupov1,*
1Kazan Federal University, Kremlevskaya 18, Kazan 420008, Russia
2Institute of Physics, ASCR, v.v.i. Na Slovance 2, 18221 Prague, Czech Republic
3Ioffe Physical-Technical Institute, Russian Academy of Sciences, 194021 St. Petersburg, Russia
*e-mail:

Abstract: A study of high-quality SrTiO3 single crystals doped with the Mn4+ ions in the cubic phase (T > 105 K) with X-band electron paramagnetic resonance reveals direct correspondence between a shape of a sample and magnetic anisotropy of the impurity Mn4+ centers. In particular, for a sample with the shape of a square base rectangular prism, a size of (a × a × h) and faces perpendicular to the <100> crystallographic directions, zero-field splitting parameter D is approximately proportional to (a / h − 1) quantity. Temperature dependence of D indicates that this peculiar symmetry lowering is a feature characteristic for the cubic Fm3m phase of the strontium titanate. Diminishing of the D value with the decrease of the surface roughness for a thin (001)-oriented SrTiO3:Mn platelet shows that the observed effect originates from the sample surface.

PACS: 73.20.Hb, 76.30.-v, 76.30.Kg.
Keywords: strontium titanate, impurity, electron paramagnetic resonance, surface-induced effect, paramagnetic probe.
Source: PDF-file (465 KB)

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Paper No. 18202 (7 pp.) (accepted November 15, 2018; published November 29, 2018)
Short reference: Magn. Reson. Solids 20, 18202 (2018)
Title: 31P and 27Al nuclear magnetic resonance studies on silver phosphate glasses
Authors: G. El-Damrawi*, A.K. Hassan, A. Shahboub
Address: Glass Research Group, Physics Department, Faculty of Science, Mansoura University, 35516 Mansoura, Egypt
*e-mail:

Abstract: Phosphate glasses of mol% xAl2O3:(40-x)Ag2O:60P2O5 have been prepared and studied by different techniques. X-ray diffraction measurement (XRD) has indicated the amorphous nature of the glasses. The hardness of the glasses increases with increasing Al2O3 concentrations. Data based on 27Al, 31P MAS NMR and Fourier transform infrared (FTIR) spectroscopy has been presented. The structural changes within the ternary phosphate glasses were correlated with that of the simple binary silver phosphate glasses. The obtained data led to suggest that aluminum plays a dual role, i.e., acts primarily as intermediate ions which means that Al2O3 enters the network of the glass both as a modifier and glass former. But silver oxide acts as a strong glass modifier. The number of non-bridging oxygen bonds (NBO) on average in the phosphate network decreases with increasing Al content. The Al2O3 in the structure of glasses exists in both Al(6) and Al(4). The concentration of Al(6) increases with increasing Al2O3 content. The concentration of Al(4) is much lower than that of Al(6) in the glass of 20 mol % Al2O3.

PACS: 74.25.nj.
Keywords: NMR, phosphate glasses, aluminum addition, structure and analysis.
Source: PDF-file (624 KB)

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Paper No. 18203 (5 pp.) (accepted December 6, 2018; published December 10, 2018)
Short reference: Magn. Reson. Solids 20, 18203 (2018)
Published as Rapid Communication
Title: Radiation-induced paramagnetic centers in nanoporous synthetic opals - a probe for near surface protons
Authors: A. Galukhin, Y. Osin, A. Rodionov, G. Mamin, M. Gafurov, S. Orlinskii*
Address: Kazan Federal University, Kremlevskaya 18, Kazan 420008, Russia
*e-mail:

Abstract: The studies of chemical processes in spatially confined conditions are of interest from the fundamental and industrial points of view. By means of the W-band EPR and 1H Mims electron nuclear double resonance (ENDOR) we show that the radiation-induced paramagnetic centers (E') in the synthetic nanoporous silica opals could be used as sensitive probes to investigate the surface modification and, potentially, reactions of polymerization in the confined by opal pores.

PACS: 76.30.-v, 76.30.Rn, 33.40.+f, 82.30.Rs.
Keywords: pores, opal films, hydrogen bonding, ENDOR, EPR.
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Paper No. 18204 (5 pp.) (accepted December 12, 2018; published December 25, 2018)
Short reference: Magn. Reson. Solids 20, 18204 (2018)
Published as Rapid Communication
Title: Magnetic and magnetoresonant properties of thin-film Fe/Ag/Co/CoO heterostructure synthesized by combined molecular beam epitaxy and reactive magnetron sputtering
Authors: I.V. Yanilkin1,*, I.R. Vakhitov1, A.I. Gumarov1, M.V. Pasynkov1, E.T. Mukhametova1, M.N. Aliyev2, R.V. Yusupov1, L.R. Tagirov1,3
1Institute of Physics, Kazan Federal University, Kazan 420008, Russia
2Baku State University, AZ-1148 Baku, Azerbaijan
3Zavoisky Physical-Technical Institute, Kazan FRC of RAS, Kazan 420029, Russia
*e-mail:

Abstract: In the paper, we report on growth conditions, structure characterization, magnetic and magnetoresonance studies of thin-film Fe/Ag/Co/CoO heterostructure deposited ontop of the single-crystal (001)-MgO substrate utilizing in situ combination of molecular beam epitaxy and magnetron sputtering. The molecular beam deposition was applied to grow the first, iron layer epitaxially on MgO realizing the 45-degree lattice matching between the magnesium oxide and the body-centered cubic iron. Subsequent silver layer was also grown epitaxially with the favorable 45-degree lattice matching between the iron and silver. Next, Co-metal and the top, cobalt oxide, layers were deposited by magnetron sputtering and reactive sputtering, respectively, after moving the sample into a magnetron sputtering chamber without breaking the ultra-high vacuum conditions. Magnetometry and ferromagnetic resonance studies of the resulting heterostructure have revealed a combination of the four-fold and uniaxial anisotropies in the film plane at temperatures well above the Neel temperature for antiferromagnetic CoO (TN = 291 K). After field-cooling of the sample down to T = 180 K, ferromagnetic resonance measurements following the major magnetic hysteresis loop have shown a correlated precession of the iron and cobalt layers magnetizations giving the evidence of the interlayer coupling through the silver interlayer.

PACS: 75.30.Gw, 75.70.Cn, 76.50.+g.
Keywords: magnetic anisotropy, ferromagnetic resonance, magnetron sputtering, magnetic hysteresis, interlayer coupling.
Source: PDF-file (393 KB)

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Paper No. 18205 (6 pp.) (accepted December 19, 2018; published December 28, 2018)
Short reference: Magn. Reson. Solids 20, 18205 (2018)
This material is prefaced a publication of papers selected at XX International Youth Scientific School "Actual problems of magnetic resonance and its application", Kazan, 24-29 September 2018. The MRSej Editors, Prof. M.S. Tagirov and Prof. V.A. Zhikharev, are responsible for the publication.
Title: Magnetic resonance: from investigation of the aging processes in human brain to the study of the structure of heavy oil fractions
Authors: M.S. Tagirov1,*, V.A. Zhikharev2
1Kazan Federal University, Kremlevskaya 18, Kazan 420008, Russia
2Kazan National Research Technological University, K. Marx street 68, Kazan 420015, Russia
*e-mail:

Abstract: A review of the twenty-year history of the activities of the International School of Young Scientists "Actual problems of magnetic resonance and its applications" in Kazan, Russia, is presented.

PACS: 01.10.Hx, 76.00.
Keywords: magnetic resonance, magnetic phenomena in solids.
Source: PDF-file (887 KB)

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Paper No. 18206 (9 pp.) (accepted December 19, 2018; published December 28, 2018)
Short reference: Magn. Reson. Solids 20, 18206 (2018)
This paper was selected at XX International Youth Scientific School "Actual problems of magnetic resonance and its application", Kazan, 24-29 September 2018. The MRSej Editors, Prof. M.S. Tagirov and Prof. V.A. Zhikharev, are responsible for the publication.
Title: The home-built pulse NMR spectrometer with CPMG sequence for 3He research at low temperatures
Authors: G.A. Dolgorukov1,*, V.V. Kuzmin1, A.V. Bogaychuk1,2, E.M. Alakshin1,2, K.R. Safiullin1,2, A.V. Klochkov1, M.S. Tagirov1,2
1Kazan Federal University, Kremlevskaya 18, Kazan 420008, Russia
2Institute of Applied Research, Tatarstan Academy of Sciences, 420111 Kazan, Russia
*e-mail:

Abstract: The home-built pulse NMR spectrometer for 3He investigations is described in this article. It operates in the 1.5-4.2 K temperature range, 0-850 mT magnetic field range, and 3-150 MHz frequency range with a dead time as short as 8 μs at 8 MHz that makes possible multinuclear NMR measurements. The spectrometer includes: saturation-recovery and inversion-recovery pulse sequences for spin-lattice relaxation time measurements by FID and Hahn echo amplitude measuring, CPMG pulse sequence for spin-spin relaxation time measurements, pulse gradient coils for diffusion measurements and a possibility to modify surface of porous samples by preadsorption of certain amount of nitrogen. The block diagrams of the spectrometer, the transmit-receive path and the amplifier are also presented.

PACS: 75.10.Dg, 76.30.-v, 75.20.
Keywords: pulsed NMR, CPMG, diffusion, 3He, low temperatures.
Source: PDF-file (2.16 MB)

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2019 To top of the Contents page

Volume 21, No 1.

Paper No. 19101 (7 pp.) (accepted December 28, 2018; published January 17, 2019)
Short reference: Magn. Reson. Solids 21, 19101 (2019)
Title: Probing the surface of synthetic opals with the vanadyl containing crude oil by using EPR and ENDOR techniques
Authors: M. Gafurov, A. Galukhin, Y. Osin, F. Murzakhanov, I. Gracheva, G. Mamin, S.B. Orlinskii*
Address: Kazan Federal University, Kremlevskaya 18, Kazan 420008, Russia
*e-mail:

Abstract: Porous silica materials offer wide range of possibilities for enhancement of the productivity of oil reservoirs. However the mechanism of adsorption of polar components of crude oil on silica surface is poorly understood that hinders technological improvement of supports and oil extraction. We have synthesized opal films with the silica microspheres size of about 360 ± 20 nm, specific surface area of 5.2 m2 × g−1 and pore size of 230 nm. We have fractionated and characterized oil and oil asphaltenes from heavy (Ashalchinskoe) oil. By pulsed electron paramagnetic resonance (EPR) and double electron nuclear resonance (ENDOR) in the W-band frequency range (microwave frequency of 94 GHz, magnetic field of 3.4 T) we have studied the adsorption of oil asphaltenes on the surface of opal samples using the intrinsic for asphaltenes paramagnetic vanadylporphyrins (VO) complexes. 1H ENDOR spectra are found to be different for initial and the adsorbed samples in their central parts (that is a sign of asphaltenes VO disaggregation) whereas no significant changes in the W-band EPR spectra were detected. Contrasting to alumina support, no strong electron proton interaction with the protons on the surface of SiO2 (presumably, silanol groups) was found and infiltration of the oiled opal films with gasoline changes the central part of 1H ENDOR spectra. It shows that the proton containing groups on the surface of amorphous SiO2 sample can significantly change the asphaltene adsorption properties and ENDOR of the intrinsic for oil paramagnetic centers could be used for the characterization of surface state in porous media in situ or operando.

PACS: 76.70.Dx, 75.10.Dg, 61.43.Bn.
Keywords: pores, opal, surface, oil, asphaltene, hydrogen, ENDOR, EPR.
Source: PDF-file (661 KB)

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Paper No. 19102 (6 pp.) (accepted January 16, 2019; published January 25, 2019)
Short reference: Magn. Reson. Solids 21, 19102 (2019)
Title: Electron paramagnetic resonance study on phosphosilicate glasses
Authors: G. El-Damrawi1,*, M. Abou Elzahab1, A. Dowadair1, A. Hosny2
1Faculty of Science, Mansoura University, 35516 Mansoura, Egypt
2Delta University for Science and Technology, Gamasa, Egypt
*e-mail:

Abstract: The phospho-silicate glass containing 10 mol% CrF2 was studied by electron paramagnetic resonance (EPR), X-ray diffraction (XRD), and transmission electron microscopy (TEM) equipped with electron diffraction apparatus which is specified for measuring the electron diffraction pattern (EDP). EPR spectroscopy offers information about oxidation states of Cr ions and their coordination symmetry in the vitreous network. The EPR spectra of Cr3+ of glass containing 10 mol% CrF2 have revealed two essential resonance signals with effective g values at geff = 4.93 and geff = 2.14. Presence of the two resonances is considered as a good evidence for the presence of trivalent chromium ions of octahedral coordination in glass containing 10 mol.% CrF2. X-ray and electron diffraction measurements on sample containing 10 mol% CrF2 have confirmed that there are some crystalline phases distributed in the main glass network. TEM micrograph has revealed a heavy accumulation of crystalline species. The glass which was exposed to irradiation process has showed different EPR signal when it compared with that of unirradiated sample.

PACS: 81.05.Pj, 75.47.Lx, 75.50.Kj.
Keywords: magnetic resonance, geff-factors, CrF2 based glass, irradiation effects.
Source: PDF-file (399 KB)

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Paper No. 19103 (5 pp.) (accepted December 19, 2018; published January 30, 2019)
Short reference: Magn. Reson. Solids 21, 19103 (2019)
This paper was selected at XX International Youth Scientific School "Actual problems of magnetic resonance and its application", Kazan, 24-29 September 2018. The MRSej Editors, Prof. M.S. Tagirov and Prof. V.A. Zhikharev, are responsible for the publication.
Title: Anomalous 141Pr nuclear magnetic relaxation in PrF3 Van Vleck paramagnet
Authors: A.S. Aleksandrov1, A.V. Egorov1,2,*, S.L. Korableva1, M.S. Tagirov1,2
1Institute of Physics, Kazan Federal University, 420008 Kazan, Russia
2Institute of Applied Research, Tatarstan Academy of Sciences, 420111 Kazan, Russia
*e-mail:

Abstract: The magnetic nuclear spin-lattice relaxation has been studied in PrF3. It was found that 141Pr spin lattice relaxation rate is untypically high for the Van Vleck insulator. According to all existing experimental data the only relaxation channel for enhanced nuclear moments at low temperatures is interaction with paramagnetic impurities and typical nuclear relaxation rate in rare earth Van Vleck paramagnets at liquid helium temperatures is 1 s−1. The measured value is 100 s−1. At the assumption that relaxation is caused by the strong 4f-4f cooperative interaction mediated by phonons [1], we measured 141Pr relaxation rates in a number of PrxLa1−xF3 samples and found that in diluted samples relaxation slows down to the usual for insulators values.

PACS: 75.10.Dg, 76.30.-v, 75.20.
Keywords: Van Vleck paramagnet, nuclear spin-lattice relaxation, enhanced NMR, pseudoquadrupole interac-tion, Davydow splitting, 4f-4f cooperative interaction.
Source: PDF-file (277 KB)

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Paper No. 19104 (7 pp.) (accepted December 19, 2018; published January 30, 2019)
Short reference: Magn. Reson. Solids 21, 19104 (2019)
This paper was selected at XX International Youth Scientific School "Actual problems of magnetic resonance and its application", Kazan, 24-29 September 2018. The MRSej Editors, Prof. M.S. Tagirov and Prof. V.A. Zhikharev, are responsible for the publication.
Title: The home-built high-field multifunctional pulsed NMR spectrometer
Authors: V.V. Kuzmin1, A.V. Bogaychuk1,2,*, I.K. Nekrasov1, K.R. Safiullin1,2, M.H. Salakhov2, E.M. Alakshin1,2, A.V. Klochkov1, M.S. Tagirov1,2
1Institute of Physics, Kazan Federal University, 420008 Kazan, Russia
2Institute of Applied Research, Tatarstan Academy of Sciences, 420111 Kazan, Russia
*e-mail:

Abstract: The home-built pulsed nuclear magnetic resonance spectrometer is described, it consists of rather cheap commercial hardware for radio frequency (RF) pulse generation and signal acquisition system. The old-stuff superconducting magnet (9 T) and modified current insert allows to vary first order cold shim gradient fields and the B0 field in the range of 0-8.5 T. The helium cryostat inserted in a wide bore of the magnet and the sample temperature control system allow to perform nuclear magnetic resonance (NMR) experiments in the temperature range of 1.65-300 K. The software created in Labview development environment synchronizes the RF excitation and acquisition systems and controls the parameters of pulse sequences and data acquisition in the 5-500 MHz range of frequencies. The maximum achieved resolution in 1H NMR spectra using first order cold shims is ca. 0.5 ppm in a spherical water sample of 5-mm diameter.

PACS: 75.10.Dg, 76.30.-v, 75.20.
Keywords: NMR spectrometer, low temperature, varying magnetic field, digital detection.
Source: PDF-file (1.22 MB)

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Paper No. 19105 (7 pp.) (accepted December 19, 2018; published January 30, 2019)
Short reference: Magn. Reson. Solids 21, 19105 (2019)
This paper was selected at XX International Youth Scientific School "Actual problems of magnetic resonance and its application", Kazan, 24-29 September 2018. The MRSej Editors, Prof. M.S. Tagirov and Prof. V.A. Zhikharev, are responsible for the publication.
Title: Study of radiation-induced stable radicals in synthetic octacalcium phosphate by pulsed EPR
Authors: D. Shurtakova1,*, B. Yavkin1,2, M. Gafurov1, G. Mamin1, S. Orlinskii1, L. Kuznetsova3, S. Bakhteev4, I. Ignatyev5, I. Smirnov6 , A. Fedotov6, V. Komlev6
1Kazan Federal University, Kremlevskaya 18, Kazan 420008, Russia
2Physikalisches Institut, University of Stuttgart, Pfaffenwaldring 57, Stuttgart 70569, Germany
3Kazan State University for Architecture and Civil Engineering, Zelenaya 1, Kazan 420043, Russia
4Kazan National Research Technological University, K. Marx Str. 41, Kazan 420015, Russia
5Interregional Clinical Diagnostic Centre, Karbysheva 12a, Kazan 420101, Russia
6A.A. Baikov Institute of Metallurgy and Materials Science, Russian Academy of Sciences, Leninsky Pr. 49, Moscow 119991, Russia
*e-mail:

Abstract: Created at room temperature by X-ray irradiation at the dose of about 5 kGy radiation-induced centers in stable octacalcium phosphate (OCP) powders obtained by double transformation of α-tricalcium phosphate (TCP) are studied by means of pulsed electron paramagnetic resonance (EPR). No EPR signals within the sensitivity of the used equipment in the non-irradiated samples were detected. In the irradiated species complex EPR spectrum signals appeared. Three types of the paramagnetic centers are decomposed in the investigated samples. Their spectroscopic parameters (components of g-factors and hyperfine constants) are defined. Based on the extracted parameters two of them are ascribed to CO2 and NO32− radicals while the nature of the third one is still questionable. The spectroscopic parameters of NO32− stable radical is found to be differ than these for TCP or hydroxyapatite. The obtained results could be used for the tracing of the mineralization processes from its initiation to the completion of the final product and for the identification of the OCP phase.

PACS: 75.10.Dg, 76.30.-v, 75.20.
Keywords: calcium phosphate, octacalcium phosphate, EPR, radiation-induced paramagnetic centers.
Source: PDF-file (474 KB)

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Paper No. 19106 (5 pp.) (accepted December 19, 2018; published February 8, 2019)
Short reference: Magn. Reson. Solids 21, 19106 (2019)
This paper was selected at XX International Youth Scientific School "Actual problems of magnetic resonance and its application", Kazan, 24-29 September 2018. The MRSej Editors, Prof. M.S. Tagirov and Prof. V.A. Zhikharev, are responsible for the publication.
Title: Decay of multiple quantum NMR coherences in quasi-one-dimensional chains in calcium fluorapatite
Authors: G.A. Bochkin1,*, E.B. Fel’dman1, I.D. Lazarev1,2, S.G. Vasil’ev1, V.I. Volkov1
1Institute of Problems of Chemical Physics of Russian Academy of Sciences, 142432 Chernogolovka, Russia
2Faculty of Fundamental Physical-Chemical Engineering, Lomonosov Moscow State University, GSP-1, 119991 Moscow, Russia
*e-mail:

Abstract: Multiple quantum (MQ) nuclear magnetic resonance (NMR) experiment is considered on chains of fluorine atoms in calcium fluorapatite. The second moments of the line shapes of the MQ coherences on the evolution period of the MQ NMR experiment are calculated analytically in the approximation of nearest neighbor interactions. The calculated values are used for a description of the experimental data with semi-phenomenological formulas assuming that the relaxation of the MQ coherences follows the Gaussian law on the evolution period. A satisfactory agreement with the experimental data is demonstrated.

PACS: 03.65.-w, 76.60.-k.
Keywords: multiple quantum NMR, multiple quantum coherence, relaxation, dipole-dipole interactions, zz model, second moments.
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Paper No. 19107 (10 pp.) (accepted December 19, 2018; published February 8, 2019)
Short reference: Magn. Reson. Solids 21, 19107 (2019)
This paper was selected at XX International Youth Scientific School "Actual problems of magnetic resonance and its application", Kazan, 24-29 September 2018. The MRSej Editors, Prof. M.S. Tagirov and Prof. V.A. Zhikharev, are responsible for the publication.
Title: Contributions of different parts of dipole-dipole interactions to relaxation of multiple quantum NMR coherences in a single crystal of calcium fluorapatite
Authors: G.A. Bochkin1,*, E.B. Fel’dman1, I.D. Lazarev1,2,*, S.G. Vasil’ev1
1Institute of Problems of Chemical Physics, 142432 Chernogolovka, Russia
2Lomonosov Moscow State University, Faculty of Physics and Chemistry, 119991 Moscow, Russia
*e-mail:

Abstract: Dipolar relaxation of multiple quantum (MQ) nuclear magnetic resonance (NMR) coherences on the evolution period of the MQ NMR experiment is investigated experimentally and theoretically in a single crystal of calcium fluorapatite. The theoretical approach is based on the zz model when the flip-flop part of the dipole-dipole interactions is not taken into account. The analytical results obtained in the zz model are compared with the numerical calculations for a chain consisting of 12 spins. The role of heteronuclear interactions of 19F and 31P nuclear spins in the dipolar relaxation of MQ NMR coherences is also investigated. A comparison of the experimental data and the theoretical predictions is discussed.

PACS: 76.30.-v, 68.65.-k.
Keywords: multiple quantum NMR, multiple quantum coherence, multiple quantum dynamics, dipolar relaxation, fermions, zz model, heteronuclear interactions.
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Paper No. 19108 (9 pp.) (accepted March 5, 2019; published March 15, 2019)
Short reference: Magn. Reson. Solids 21, 19108 (2019)
Title: Tables of functions transforming according to the irreducible representations of crystal point cubic T and Th groups
Authors: A.M. Leushin
Address: Kazan Federal University, Kremlevskaya 18, Kazan 420008, Russia
*e-mail:

Abstract: The functions transforming according to the nonequivalent irreducible representations (IR) Γ'2, Γ'3 and Γ'6, Γ'7 have been found using the projection operators of the IR DS of the full rotation group on the subspaces of IR of T, T' and Th, T'h cubic groups. With allowance for the properties with respect to the operation of the time reversal sign, the functions are combined into representations Γ'23 and Γ'67 respectively, of twice the larger dimension. Along with the functions transforming according to all other IRs Γ'1, Γ'4 and Γ'5 presented earlier, they will facilitate the consideration of various kinds of effects due to the energy level splitting of rare-earth ions in the crystal electric fields of T, and Th group symmetry.

PACS: 31.15.xh, 71.70.Ñh, 75.10.Dg, 76.30.Kg.
Keywords: crystal electrical fields, cubic T and Th groups, function of irreducible representations, rare earth, EPR, inelastic neutron scattering spectra.
Source: PDF-file (254 KB)

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