SPIRAL STATE AND GIANT MAGNETORESISTANCE IN PEROVSKITE MN OXIDES

被引：209

作者：

INOUE, J

MAEKAWA, S

机构：

[1] Department of Applied Physics, Nagoya University

来源：

PHYSICAL REVIEW LETTERS | 1995年 / 74卷 / 17期

关键词：

D O I：

10.1103/PhysRevLett.74.3407

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

A spiral state is proposed to be the stable magnetic structure of perovskite (La-X)MnO3 (X: Ba, Ca, or Sr) with a low concentration of X ions, contrary to the canted state predicted before. We use a mean field approximation applied to a model which treats t2g and eg electrons of Mn ions as localized spins and strongly correlated itinerant electrons, respectively, and includes a strong Hund coupling between them. We find that the Hund coupling is crucial for the giant magnetoresistance observed in (La-X)MnO3, indicating that the Hund coupling enhances the dependence of the resistivity on the induced magnetization in agreement with experiments. © 1995 The American Physical Society.

引用

页码：3407 / 3410

页数：4

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