Zn-impurity effect and interplay of s± and s++ pairings in iron-based superconductors

被引：20
|
作者：
Yao, Zi-Jian [1 ,2 ]
Chen, Wei-Qiang [1 ,2 ,3 ]
Li, Yu-ke [4 ]
Cao, Guang-han [5 ]
Jiang, Hong-Min [1 ,2 ,4 ]
Wang, Qian-En [1 ,2 ]
Xu, Zhu-an [5 ]
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] S Univ Sci & Technol China, Dept Phys, Shenzhen 518055, Peoples R China
[4] Hangzhou Normal Univ, Dept Phys, Hangzhou 310036, Zhejiang, Peoples R China
[5] Zhejiang Univ, Dept Phys, Hangzhou 310058, Zhejiang, Peoples R China
来源：
PHYSICAL REVIEW B | 2012年 / 86卷 / 18期
关键词：
D O I：
10.1103/PhysRevB.86.184515
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
We report theoretical and experimental studies of the effect of Zn impurity in Fe-based superconductors. Zn impurity is expected to severely suppress sign reversed s(+/-)-wave pairing. The experimentally observed suppression of T-c under Zn doping strongly depends on the materials and the charge-carrier contents, which suggests competition of s(++) and s(+/-) pairings in Fe-based superconductors. We study a model incorporating both s(++)- and s(+/-)-pairing couplings by using the Bogoliubov de-Gennes equation, and we show that the Zn impurity strongly suppresses s(+/-) pairing and may induce a transition from the s(+/-) to s(++) wave. Our theory is consistent with various experiments on the impurity effect. We present new experimental data on the Zn-doping SmFe1-xZnxAsO0.9F0.1 of T-c = 50 K, in further support of our proposal.
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页数：6
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