Theory of Half-Metallic Ferrimagnetism in Double Perovskites

被引：86

作者：

Erten, Onur ^{[1
]}

Meetei, O. Nganba ^{[1
]}

Mukherjee, Anamitra ^{[1
]}

Randeria, Mohit ^{[1
]}

Trivedi, Nandini ^{[1
]}

Woodward, Patrick ^{[2
]}

机构：

[1] Ohio State Univ, Dept Phys, Columbus, OH 43210 USA

[2] Ohio State Univ, Dept Chem, Columbus, OH 43210 USA

来源：

PHYSICAL REVIEW LETTERS | 2011年 / 107卷 / 25期

基金：

美国国家科学基金会;

关键词：

DISORDER;

D O I：

10.1103/PhysRevLett.107.257201

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Double perovskites such as Sr2FeMoO6 are rare examples of materials with half-metallic ground states and a ferrimagnetic T-c above room temperature. We present a comprehensive theory of the temperature and disorder dependence of their magnetic properties by deriving and validating a new effective spin Hamiltonian for these materials, amenable to large-scale three-dimensional simulations. We show how disorder, ubiquitous in these materials, affects T-c, the magnetization, and the conduction electron polarization. We conclude with a novel proposal to enhance T-c without sacrificing polarization.

引用

页数：4

共 17 条

[11] Raising the Curie temperature in Sr2FeMoO6 double perovskites by electron doping -: art. no. 092411 [J].