Spin fluctuations in La2/3Ca1/3MnO3 probed by 57Fe and 119Sn Mossbauer spectroscopy

被引：18
|
作者：
Simopoulos, A [1 ]
Kallias, G [1 ]
Devlin, E [1 ]
Panagiotopoulos, I [1 ]
Pissas, M [1 ]
机构：
[1] NCSR Demokritos, Inst Mat Sci, GR-15310 Athens, Greece
来源：
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 1998年 / 177卷
关键词：
Mossbauer spectroscopy; relaxation; magnetoresistance; mixed valence manganese perovskites;
D O I：
10.1016/S0304-8853(97)00743-9
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Spin fluctuations in two samples of the La2/3Ca1/3MnO3 system doped with 1% Fe-57 and 5% Sn were studied by Mossbauer spectroscopy. Fe substitutes for Mn3+ and Sn for Mn4+. A charge redistribution occurs between 4.2 K and T-c. The charge carrier concentration defines magnetic regions with different coupling constants which fluctuate with relaxation rates increasing exponentially with temperature. At similar to 0.9T(c) both probes reveal charge localization which spreads fast in the Mn3+/Mn4+ lattice as the temperature approaches T-c. (C) 1998 Elsevier Science B.V. All rights reserved.
引用
收藏
页码：860 / 861
页数：2
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