Ferromagnetic transition in ordered double perovskites and related alloys

被引：33

作者：

Carvajal, E

Navarro, O

Allub, R

Avignon, M

Alascio, B

机构：

[1] Univ Nacl Autonoma Mexico, Inst Invest Mat, Mexico City 04510, DF, Mexico

[2] Ctr Atom Bariloche, Inst Balseiro, RA-8400 San Carlos De Bariloche, Rio Negro, Argentina

[3] CNRS, Etud Proprietes Elect Solides Lab, F-38042 Grenoble, France

来源：

EUROPEAN PHYSICAL JOURNAL B | 2005年 / 48卷 / 02期

关键词：

D O I：

10.1140/epjb/e2005-00386-9

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

We study the electronic and magnetic properties of ordered perovskites Sr 2FeMO6 (where M is a transition metal), among which some compounds, like Sr2FeMoO6 are half-metallic with high Curie temperature while Sr2FeWO6 is an antiferromagnetic insulator. Using a double exchange type model with an interaction between localized spins and conduction electrons together with a tight-binding Hamiltonian and the renormalized perturbation expansion method, we study the behavior of T-c as a function of the number of conduction electrons and also as a function of the Fe-M energy difference. We also consider the Sr2FeMoxW1-xO6 compounds which present a magnetic and metal-insulator transition as a function of doping.

引用

页码：179 / 187

页数：9

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