Strong Coupling Theory for Superconducting Iron Pnictides

被引：77
|
作者：
Chen, Wei-Qiang [1 ,2 ]
Yang, Kai-Yu [1 ,2 ,3 ]
Zhou, Yi [4 ]
Zhang, Fu-Chun [1 ,2 ,5 ]
机构：
[1] Univ Hong Kong, Dept Phys, Hong Kong, Hong Kong, Peoples R China
[2] Univ Hong Kong, Ctr Theoret & Computat Phys, Hong Kong, Hong Kong, Peoples R China
[3] ETH, Inst Phys, CH-8093 Zurich, Switzerland
[4] Chinese Univ Hong Kong, Dept Phys, Hong Kong, Hong Kong, Peoples R China
[5] Zhejiang Univ, Dept Phys, Hangzhou 310003, Zhejiang, Peoples R China
来源：
PHYSICAL REVIEW LETTERS | 2009年 / 102卷 / 04期
关键词：
PHASE-DIAGRAM;
D O I：
10.1103/PhysRevLett.102.047006
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
Superconductivity in iron pnictides is studied by using a two-orbital Hubbard model in the large U limit. The Coulomb repulsion induces an orbital-dependent pairing between charge carriers. The pairing is found mainly from the scattering within the same Fermi pocket. The interpocket pair scatterings determine the symmetry of the superconductivity, which is extended s wave at small Hund's coupling, and d wave at large Hund's coupling and large U. The former is consistent with recent experiments of angle-resolved photoemission spectroscopy and Andreev reflection spectroscopy.
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页数：4
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