Orbital degree of freedom and phase separation in ferromagnetic manganites at finite temperatures

被引：64

作者：

Okamoto, S ^{[1
]}

Ishihara, S ^{[1
]}

Maekawa, S ^{[1
]}

机构：

[1] Tohoku Univ, Inst Mat Res, Sendai, Miyagi 9808577, Japan

来源：

PHYSICAL REVIEW B | 2000年 / 61卷 / 01期

关键词：

D O I：

10.1103/PhysRevB.61.451

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The spin and orbital phase diagram for perovskite manganites is investigated as a function of temperature and hole concentration. The superexchange and double exchange interactions dominate the ferromagnetic phases in the lightly and moderately doped regions of holes, respectively. The two interactions favor different orbital states. Between the phases, two interactions compete with each other and the phase separation appears in the wide range of temperature and hole concentration. The anisotropy of the orbital space causes discontinuous changes of the orbital state and promotes the phase separation.

引用

页码：451 / 458

页数：8

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