Electron-hole symmetry and magnetic coupling in antiferromagnetic LaFeAsO

被引：272

作者：

Yin, Z. P. ^{[1
]}

Lebegue, S. ^{[1
,2
]}

Han, M. J. ^{[1
]}

Neal, B. P. ^{[1
]}

Savrasov, S. Y. ^{[1
]}

Pickett, W. E. ^{[1
]}

机构：

[1] Univ Calif Davis, Dept Phys, Davis, CA 95616 USA

[2] Univ Henri Poincare, CNRS, UMR 7036, Lab Cristallog & Modelisat Mat Mineraux & Biol, F-54506 Vandoeuvre Les Nancy, France

来源：

PHYSICAL REVIEW LETTERS | 2008年 / 101卷 / 04期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1103/PhysRevLett.101.047001

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

When either electron or hole doped at concentrations x similar to 0.1, the LaFeAsO family displays remarkably high temperature superconductivity with T-c up to 55 K. In the most energetically stable (Q) over right arrow (M) = (pi, pi, 0) antiferromagnetic (AFM) phase comprised of tetragonal-symmetry breaking alternating chains of aligned spins, there is a deep pseudogap in the Fe 3d states centered at the Fermi energy arising from light carriers (m* similar to 0.25-0.33), and very strong magnetophonon coupling is uncovered. Doping (of either sign) beyond x similar to 0.08 results in heavy carriers per Fe (by roughly an order of magnitude) with a large Fermi surface. Calculated Fe-Fe transverse exchange couplings J(ij)(R) reveal that exchange coupling is strongly dependent on both the AFM symmetry and on the Fe-As distance.

引用

页数：4

共 41 条

[1] POSSIBLE HIGH-TC SUPERCONDUCTIVITY IN THE BA-LA-CU-O SYSTEM [J].