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.

引用

页数：6

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