Ferromagnetism below the stoner limit in La-doped SrB6

被引：20

作者：

Jarlborg, T ^{[1
]}

机构：

[1] Univ Geneva, DPMC, CH-1211 Geneva, Switzerland

来源：

PHYSICAL REVIEW LETTERS | 2000年 / 85卷 / 01期

关键词：

D O I：

10.1103/PhysRevLett.85.186

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Spin-polarized band calculations for LaSr7B48 show a weak ferromagnetic state. This is despite a low. density of states (DOS) and a low Stoner factor. The reason for the magnetic state is found to be associated with a gain in potential energy in addition to the exchange energy, as a spin splitting is imposed. A DOS with an impuritylike La band is essential for this effect. It makes a correction to the Stoner factor and provides an explanation of the recently observed weak ferromagnetism in doped hexaborides.

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页码：186 / 189

页数：4

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