Stability of the magnetic phase in half-doped manganites

被引：3

作者：

Ohsawa, T ^{[1
]}

Inoue, J ^{[1
]}

机构：

[1] Nagoya Univ, Dept Appl Phys, Nagoya, Aichi 4648603, Japan

来源：

PHYSICAL REVIEW B | 2002年 / 65卷 / 01期

关键词：

D O I：

10.1103/PhysRevB.65.014401

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The stability of the magnetic phase of quarter-filled manganites was studied using the two-orbital double-exchange model with the effect of lattice distortion and Coulomb repulsion in a mean field approximation for two-dimensional systems. A magnetic phase diagram is depicted in a plane of the lattice distortion and the superexchange interaction between localized t(2g) spins. When the ratio of the superexchange interaction to the hopping integral is small, a ferromagnetic ground state with d(x2-y2) orbital ordering is stabilized, With increases in the ratio, the ferromagnetic ground state changes to a charge-ordered CE type antiferromagnetic state irrespective of the lattice distortion. The respective roles of the carious ingredients included in the model are discussed, and theoretical and experimental results are compared. We also discuss die effects of Fe and Cr substitution for Mn ions with regards to the stability of the CE phase.

引用

页码：1 / 7

页数：7

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