Polaron transport and lattice dynamics in colossal-magnetoresistance manganites

被引：86

作者：

Lee, JD

Min, BI

机构：

[1] Department of Physics, Pohang University of Science and Technology

来源：

PHYSICAL REVIEW B | 1997年 / 55卷 / 18期

关键词：

D O I：

10.1103/PhysRevB.55.12454

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Based on the model combining the spin double exchange and the lattice polaron, we have studied the colossal-magnetoresistance phenomena observed in perovskite manganites R(1-x)A(x)MnO(3). First, effects of both the double exchange and the electron-phonon interaction on the transport properties are investigated. We have evaluated the temperature-dependent resistance and the magnetoresistance using the Kubo formula, and examined the crossover from the tunneling to hopping regime of small polarons. Second, effects of the double-exchange interaction on the lattice degree of freedom are explored. It is found that both the hardening of the phonon frequency and a reduction of the phonon damping take place with decreasing the temperature.

引用

页码：12454 / 12459

页数：6

共 25 条

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