Theory of electron nematic order in LaFeAsO

被引：584

作者：

Fang, Chen ^{[1
]}

Yao, Hong ^{[2
]}

Tsai, Wei-Feng ^{[2
,3
]}

Hu, JiangPing ^{[1
]}

Kivelson, Steven A. ^{[2
]}

机构：

[1] Purdue Univ, Dept Phys, W Lafayette, IN 47907 USA

[2] Stanford Univ, Dept Phys, Stanford, CA 94305 USA

[3] Univ Calif Los Angeles, Dept Phys & Astron, Los Angeles, CA 90095 USA

来源：

PHYSICAL REVIEW B | 2008年 / 77卷 / 22期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1103/PhysRevB.77.224509

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We study a spin S quantum Heisenberg model on the Fe lattice of the rare-earth oxypnictide superconductors. Using both large S and large N methods, we show that this model exhibits a sequence of two phase transitions: from a high-temperature symmetric phase to a narrow region of intermediate "nematic" phase, and then to a low-temperature spin ordered phase. Identifying phases by their broken symmetries, these phases correspond precisely to the sequence of structural (tetragonal to monoclinic) and magnetic transitions that have been recently revealed in neutron-scattering studies of LaFeAsO. The structural transition can thus be identified with the existence of incipient ("fluctuating") magnetic order.

引用

页数：6

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