Ferromagnetism and superstructure in Ca1-xLaxB6

被引：75

作者：

Barzykin, V

Gor'kov, LP

机构：

[1] Florida State Univ, Natl High Magnet Field Lab, Tallahassee, FL 32310 USA

[2] LD Landau Theoret Phys Inst, Chernogolovka 142432, Russia

来源：

PHYSICAL REVIEW LETTERS | 2000年 / 84卷 / 10期

关键词：

D O I：

10.1103/PhysRevLett.84.2207

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We critically investigate the model of a doped excitonic insulator, which has recently been invoked to explain some experimental properties of the ferromagnetic state in Ca1-xLaxB6. We demonstrate that the ground state of this model is intrinsically unstable towards the appearance of a superstructure. In addition, the model would lead to a phase separation of doped carriers into electron-enriched and neutral domains, which may be prevented by Coulomb forces only. Recent experiments indicate that a superstructure may indeed show up in this material.

引用

页码：2207 / 2210

页数：4