Nodal spin density wave and band topology of the FeAs-based materials

被引：203

作者：

Ran, Ying ^{[1
]}

Wang, Fa

Zhai, Hui

Vishwanath, Ashvin

Lee, Dung-Hai

机构：

[1] Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA

来源：

PHYSICAL REVIEW B | 2009年 / 79卷 / 01期

关键词：

band structure; doping; ferromagnetic materials; iron compounds; spin density waves; stoichiometry; tight-binding calculations; type II superconductors; LAYERED QUATERNARY COMPOUND; SUPERCONDUCTIVITY;

D O I：

10.1103/PhysRevB.79.014505

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The recently discovered FeAs-based materials exhibit a (pi,0) spin density wave (SDW) in the undoped state, which gives way to superconductivity upon doping. Here we show that due to an interesting topological feature of the band structure, the SDW state cannot acquire a full gap. This is demonstrated within the SDW mean-field theory of both a simplified two-band model and a more realistic five-band model. The positions of the nodes are different in the two models and can be used to detect the validity of each model.

引用

页数：9

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