MRSej, Vol. 6, No.1, pp.155-163, 2004
H.-A. Krug von Nidda1 , G . Kruschel2 , A . Loidl1 , and B. Elschner2
1University of Augsburg , 86135 Augsburg , Germany
2 Technical University of Darmstadt , 64289 Darmstadt , Germany
The electron-spin resonance (ESR) of La2-xSrxCu1-yFeyO4 is investigated on polycrystalline samples for 0 <= x <= 0.3 and 0 <= y <= 0.1. The ESR spectrum consists of the superposition of two Lorentzian lines, which can be unambiguously attributed to Fe3+ and intrinsic Cu-spin polaron signals. The simultaneous observation of both signals allows to describe the temperature dependence of the relaxation of the Fe3+ ions in terms of Cu-spin fluctuations.
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