Iron-based layered compound LaFeAsO is an antiferromagnetic semimetal

被引：195

作者：

Ma, Fengjie ^{[1
]}

Lu, Zhong-Yi ^{[2
]}

机构：

[1] Chinese Acad Sci, Inst Theoret Phys, Beijing 100080, Peoples R China

[2] Renmin Univ China, Dept Phys, Beijing 100872, Peoples R China

来源：

PHYSICAL REVIEW B | 2008年 / 78卷 / 03期

关键词：

D O I：

10.1103/PhysRevB.78.033111

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

LaFeAsO is a parent compound of iron-based F-doped superconductors. An understanding of its ground phase and electronic structure is a precondition to understanding the underlying superconductivity mechanism. Our study shows that LaFeAsO is a quasi-two-dimensional antiferromagnetic semimetal with most carriers being electrons and with a magnetic moment of 2.3 mu(B) located around each Fe atom on the Fe-Fe square lattice. Physically, this is a commensurate antiferromagnetic spin-density wave due to the Fermi-surface nesting. The observed superconduction after the F doping happens on the Fe-Fe layer suggesting a new superconductivity mechanism mediated by spin fluctuations.

引用

页数：4

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