Phase transition in perovskite manganites with orbital degree of freedom

被引：32

作者：

Okamoto, S ^{[1
]}

Ishihara, S ^{[1
]}

Maekawa, S ^{[1
]}

机构：

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

来源：

PHYSICAL REVIEW B | 2000年 / 61卷 / 21期

关键词：

D O I：

10.1103/PhysRevB.61.14647

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Roles of orbital degree of freedom of Mn ions in phase transition as functions of temperature and hole concentration in perovskite manganites are studied. It is shown that the orbital order-disorder transition is of the first order in the wide region of hole concentration, and the Neel temperature for the anisotropic spin ordering, such as the layer-type antiferromagnetic one, is lower than the orbital ordering temperature due to the anisotropy in the orbital space. The calculated results of the temperature dependence of the spin and orbital order parameters explain a variety of the experiments observed in manganites.

引用

页码：14647 / 14655

页数：9

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