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
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
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页码:2207 / 2210
页数:4
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