Magnetic Resonance in Solids. Electronic Journal.

Contents:  2011 2010 2009 2008 2007 2006 2005 2004 2001 2000 1999 1998 1997

2011 MRSej, Vol. 13,

No 1.

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

No 2.

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

pp. 27-35  Anikeenok O.A.

    Approach to calculation of long range Coulomb interaction matrix elements in ion crystals

2010 MRSej, Vol. 12,

No 1.

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 KTa_0.988Nb_0.012O₃ 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

No 2.

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

2009 MRSej, Vol. 11,  

Third International Meeting of Prof. Kochelaev's Scholars (BIK-75) dedicated to the 75th birthday of Prof. Boris I. Kochelaev (April, 19, 2009) (In Russian only)

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

No 1.
pp. 1-6   O.A. Anikeenok

    The Coulomb interaction between an s-orbital electron and ionic crystal lattice

pp. 7-13   A.S. Kutuzov, A.M.Skvortsova

    Determination of tetragonal crystalline electric field parameters for Yb³⁺ and Ce³⁺ ions from experimental g factors values and energy levels of Kramers doublets  
pp. 14-19   O.V. Solovyev

    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.

    Inverse Laplace transform of ³He NMR relaxation data in porous media

2008 MRSej, Vol. 10, 

No 1.
pp. 1-5   A.V. Fokin, V.B. Guseva, M.Yu. Artyomov

    Models of Gd³⁺ Paramagnetic Centers in Tetrahedral Yttrium Clusters in Cadmium Fluoride
pp. 6-10   A.Yu. Orlova, R.R. Gainov, A.V. Dooglav, I.N. Pen'kov, N.N. Mozgova
    Copper NQR studies of Ag-doped ternary sulfide Cu₁₂As₄S₁₃ (tennantite)
pp. 11-19   N.V. Shkalikov, Yu.M. Ganeeva, T.N. Yusupova, V.D. Skirda
    The characterization of asphaltenes by ¹H NMR relaxation method: microsecond range of spin-spin relaxation times
pp. 20-24   A.A. Levantovsky, A.V. Komolkin
    Application of Non-Linear Approximation for Electron Paramagnetic Resonance Spectrum Analysis: Visual Spectrum Decomposer Software
pp. 25-30   A.L. Kovarski, A.V. Bychkova, O.N. Sorokina, V.V. Kasparov
    Temperature Effects in the FMR spectra of Magnetic Nanoparticles Dispersed in Polymer Film and Viscous Fluid  
pp. 31-38   N.A. Mavrinskaya, L.A. Pesin, M. Baumgarten, A.V. Mavrinskiy, E.M. Baitinger, S.E. Evsyukov
    ESR Studies of Chemically Dehydrofluorinated Poly(vinylidene fluoride)  
pp. 39-45   Ya.V. Baklanova
    H and ⁷Li NMR in Li_2-xH_xMO₃ (M = Ti, Zr)  

2007 MRSej, Vol. 9,

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

2006 MRSej, Vol. 8,  

 V.V. Demidov, F.S. Dzheparov, E.B. Feldman, N.P. Fokina, B.I. Kochelayev,
T.N. Khazanovich, Ye.K. Khenner, A.A. Lundin, A.Ye. Mefed, N.Ye. Noginova,
M.I. Rodak, O.A. Ryabushkin, K.M. Salikhov, M.S. Tagirov, V.A. Zhikharev, V.Ye. Zobov
    Prof. V.A. Atsarkin (to 70th anniversary)

No 1.
Preface    M. Tagirov, V. Zhikharev     
pp. 1-5   I.V. Romanova, R.Yu. Abdulsabirov, S.L. Korableva, B.Z. Malkin, I.R. Mukhamedshin, H. Suzuki, M.S. Tagirov
    Magnetoelastic Effects and Magnetization in LiDyF₄ and LiHoF₄ Single Crystals
pp. 6-9    M.V. Sundukova, A.R. Mutina, A.I. Skorinkin
     Inhibition of Water Transport Across Cell Membranes by Dimephosphon
pp. 10-14    S.I. Doronin, E.I. Kuznetsova, E.B. Feldman, S.D. Goren, G.B. Furman
     Multiple Quantum NMR Dynamics in Spin Systems in Dipolar Ordered State
pp. 15-19    M.N. Uvarov, L.V. Kulik, M.A. Bizin, V.N. Ivanova, R.B. Zaripov, S.A. Dzuba
     Triplet state dynamics of fullerene C₆₀ studied by pulse EPR
pp. 20-23    K.A. Kozhanov, M.P. Bubnov, V.K. Cherkasov, G.K. Fukin, N.N. Vavilina, L.Yu. Efremova, G.A. Abakumov
     An EPR Monitoring of Isomerism and Coordination Sphere Dynamics in Five-Coordinated Pincer Nickel Complexes
pp. 24-27    G.V. Mamin, A.A. Rodionov, M.S. Tagirov, D.A. Tayursky, B. Odintsov
     The Surface Effects Influence on Magnetic Resonance in Carbonizate
pp. 28-32    A.A. Gippius, E.N. Morozova, K.S. Okhotnikov, A.S. Moskvin
     NMR study of quasi-1D magnetic chain in cuprates LiCu₂O₂ and NaCu₂O₂
pp. 33-37    S.I. Doronin, E.B. Fel'dman, A.N. Pyrkov
     Entanglement in One-Dimensional Open Chains of Spins 1/2 with XY-Hamiltonian
pp. 38-42    N.V. Shkalikov, V.D. Skirda, R.V. Arkhipov
     Solid-like Component in the Spin-Spin NMR-Relaxation of Heavy Oils
pp. 43-47    D.M. Druzhnov, E.S. Demidov, Yu.A. Danilov,Yu.N. Drosdov, V.P. Lesnikov, V.V. Podolskii, M.V. Sapozhnikov, S.N. Gusev, A.I. Suchkov
     Ferromagnetism in Thin Films of Germanium and Silicon Supersaturated by Manganese or Iron Impurities
pp. 48-52    D.V. Guseinov, A.A. Ezhevskii
     Spin Relaxation of Electrons Localized on Shallow and Deep Donor Centers in Silicon with Different Isotopic Composition

2005 MRSej, Vol. 7,

No 1,         A.D. Ineev, B.I. Kochelaev

    Creation and Stability of Skyrmion State in Two-Dimensional Magnets at Doping

2004 MRSej, Vol. 6,  

No 1,        Dedicated to Boris I. Kochelaev's 70th birthday SPECIAL ISSUE (22 papers)

No 2,         V.M. Vinokurov, A.R. Al-Sufi, A.E. Usachev

    Jahn-Teller Effect of Cu²⁺ ions in a Zinc Selenate Hexahydrate Single Crystal

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:

1. TeX-file (35 kB) or DVI-file (47 kB) or ZIP-ed DVI-file (20 kB)+ ZIP-ed EPS figures (95 kB)
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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-T_c 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-T_c superconductivity, strongly correlated electronic system, spin susceptibility
Sources:

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Volume 1, No 3, 6 pages  (accepted: December 11, 1997).

Title: Temperature dependencies of g-factors in GdBa₂Cu₃O_6+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 GdBa₂Cu₃O_6+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-T_c superconductors, EPR
Sources:

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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-T_c superconductivity, nuclear magnetic resonance, vortex lattice
Sources:

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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 CuO₄^5- in doped cuprates is in their unusually complicated ground state as a result of electronic quasi-degeneracy. An additional hole, doped to the basic CuO₄^6- cluster with the b_1g hole can occupy both the same hybrid Cu3d-O2p orbital state resulting in a Zhang-Rice singlet ¹A_1g and the purely oxygen e_u molecular orbital resulting in singlet or triplet ^1,3E_u  term with the close energies. We present a detailed analysis of the (pseudo)-Jahn-Teller effect driven by the near-degeneracy within the (¹A_1g, ^1,3E_u)-manifold.

PACS: 71.27.+a, 74.20.s, 74.25.Ha, 76.60.-k
Keywords: cuprates, spin fluctuations, hyperfine coupling, nuclear resonance
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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
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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
e-mail: george.mamin@ksu.ru,   vladimir.efimov@ksu.ru

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: 

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 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
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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: 

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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: 

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 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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Pages: 1-5 (accepted: December 1, 2006)
Title: Magnetoelastic Effects and Magnetization in LiDyF₄ and LiHoF₄ Single Crystals
Authors: I.V. Romanova^1,2,*, R.Yu. Abdulsabirov¹, S.L. Korableva¹, B.Z. Malkin¹, I.R. Mukhamedshin^1,2, 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: 

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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
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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. Kuznetsova^1,*, 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
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Pages: 15-19  (accepted: December 4, 2006)
Title: Triplet state dynamics of fullerene C₆₀ studied by pulse EPR
Authors: M.N. Uvarov^1,*, 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: 

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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: 

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Pages: 24-27  (accepted: December 5, 2006)
Title: The Surface Effects Influence on Magnetic Resonance in Carbonizate
Authors: G.V. Mamin¹, A.A. Rodionov^1,*, 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
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Pages: 28-32  (accepted: December 8, 2006)
Title: NMR study of quasi-1D magnetic chain in cuprates LiCu₂O₂ and NaCu₂O₂
Authors: A.A. Gippius^1,2, E.N. Morozova^1,2, K.S. Okhotnikov^1,*, 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 T_c = 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 T_c 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
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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
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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 str. 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 (T_2s = 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 P_S of ¹H NMR signal were measured for whole row oil samples. The correlation between the part P_S 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 P_S 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
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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. Druzhnov^1,*, E.S. Demidov¹, Yu.A. Danilov^1,2,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
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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
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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
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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 q_x, q_y  plane have been obtained. Anisotropy of the depairing total momentum (or depairing current) has been calculated.

Keywords: high-T_c superconductors, depairing current
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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. Burova^1,*, 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
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Volume 9, No 2.

Pages: 1-5 (accepted: December 11, 2007)
Title: Image-Potential States in Small Metal Particles
Authors: M.A. Fayzullin^1,*, 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
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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
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Pages: 6-10 (accepted: February 4, 2008)
Title: Copper NQR studies of Ag-doped ternary sulfide Cu₁₂As₄S₁₃ (tennantite)
Authors: A.Yu. Orlova¹, R.R. Gainov^1,*, 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
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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. Shkalikov^1,*, 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 P_s 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
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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
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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
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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
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Pages: 39-45 (accepted: May 28, 2008)
Title: ¹H and ⁷Li NMR in Li_2-xH_xMO₃ (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
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Third International Meeting of Prof. Kochelaev's Scholars (BIK-75) dedicated to the 75th birthday of Prof. Boris I. Kochelaev (April, 19, 2009) (In Russian only) )

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 str., 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
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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 str., 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
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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 str., 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
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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: 

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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
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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 La_2-xSr_xCuO₄.

PACS: 74.72.-h; 74.25.Ha; 75.40.Gb
Keywords: cuprate superconductors, dynamic spin susceptibility
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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.
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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. Morozov^1,2,*, O.V. Shabanova² , V.F. Pavlov², O.V. Falaleev^1,2
Addresses: 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.
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Pages: 7-11 (accepted: February 1, 2010)
Title: Photoinduced EPR in KTa_0.988Nb_0.012O₃ crystals
Authors: A.I. Gubaev¹, A.A. Rodionov², M.Kh. Salakhov², I.N. Subacheva^2,*, P.P. Syrnikov³, V.A. Trepakov^3,4, Yusupov²
Addresses: 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 KTa_1-xNb_xO₃ crystals (x = 0.012). The signal has two components: nearly isotropic with g_eff = 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 g_parallel = 2.106(3) and g_normal < 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
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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
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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
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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. Nizameev^1,*1, M.S. Pudovkin², M.K. Kadirov¹
Address: 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
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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
Addresses: 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.
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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
Addresses: 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.
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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
Addresses: 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.
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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
Addresses: 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.
Sources:

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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
Addresses: 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.
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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
Authors: O.A. Anikeenok
Addresses: 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.
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