Positive and negative magnetoresistance in mixed superexchange -: Double exchange systems

被引:0
作者
Bärner, K
Mandal, P
Kattwinkel, A
Ahmed, AM
Helmolt, RV
Sun, JR
Rao, GH
机构
[1] Univ Gottingen, Inst Phys 4, D-37073 Gottingen, Germany
[2] Saha Inst Nucl Phys, Kolkata 700064, W Bengal, India
[3] S Valley Univ, Phys Dept, Sohag, Egypt
[4] Adam Opel AG, Global Alternat Prop Ctr, D-65423 Russelsheim, Germany
[5] Inst Phys, Beijing 100080, Peoples R China
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中图分类号
TF [冶金工业];
学科分类号
0806 ;
摘要
The occurrence of a large positive and negative magnetoresistance (+/-MR) in mixed magnetically coupled and weakly lattice-coupled spin systems is discussed and compared with an experimentally observed example of GMR in manganites R1-xExMnO3-delta, i.e., oxygen deficient La0.7Ca0.3MnO3-delta. We indeed find even some of the more capricious features of the MR reproduced by experiment and the condition that the metal-insulator (T-mi) and ferromagnetic-paramagnetic transition (T-c) do not coincide. In addition, the resistivity rho (T), the magnetoresistance, and the thermopower of two nondeficient compounds, i.e., La0.7Ca0.1Mn1-yFeyO3, y = 0, 0.02, are presented. In these cases, we also find a split of T-c and T-mi plus a correlation of the magnetoresistance (MR) and the thermoelectric power S(T).
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页码:S164 / S167
页数:4
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