Nematic superconducting state in iron pnictide superconductors

被引：35

作者：

Li, Jun ^{[1
,2
,3
]}

Pereira, Paulo J. ^{[3
,4
]}

Yuan, Jie ^{[1
,2
,5
,6
]}

Lv, Yang-Yang ^{[1
]}

Jiang, Mei-Ping ^{[1
]}

Lu, Dachuan ^{[1
]}

Lin, Zi-Quan ^{[7
,8
]}

Liu, Yong-Jie ^{[7
,8
]}

Wang, Jun-Feng ^{[7
,8
]}

Li, Liang ^{[7
,8
]}

Ke, Xiaoxing ^{[9
]}

Van Tendeloo, Gustaaf ^{[9
]}

Li, Meng-Yue ^{[1
,2
]}

Feng, Hai-Luke ^{[2
]}

Hatano, Takeshi ^{[2
]}

Wang, Hua-Bing ^{[1
,2
]}

Wu, Pei-Heng ^{[1
,10
]}

Yamaura, Kazunari ^{[2
,11
]}

Takayama-Muromachi, Eiji ^{[2
,11
]}

Vanacken, Johan ^{[3
]}

Chibotaru, Liviu F. ^{[4
]}

Moshchalkov, Victor V. ^{[3
]}

机构：

[1] Nanjing Univ, Res Inst Superconductor Elect, Nanjing 210093, Jiangsu, Peoples R China

[2] Natl Inst Mat Sci, Tsukuba, Ibaraki 3050044, Japan

[3] Katholieke Univ Leuven, INPAC, B-3001 Leuven, Belgium

[4] Katholieke Univ Leuven, Theory Nanomat Grp, B-3001 Leuven, Belgium

[5] Chinese Acad Sci, Natl Lab Superconduct, Inst Phys, Beijing 100080, Peoples R China

[6] Chinese Acad Sci, Beijing Natl Lab Condensed Matter Phys, Beijing 100080, Peoples R China

[7] Huazhong Univ Sci & Technol, Wuhan Natl High Magnet Field Ctr, Wuhan 430074, Hubei, Peoples R China

[8] Huazhong Univ Sci & Technol, Sch Phys, Wuhan 430074, Hubei, Peoples R China

[9] Univ Antwerp, Electron Microscopy Mat Res EMAT, B-2020 Antwerp, Belgium

[10] Univ Sci & Technol China, Synerget Innovat Ctr Quantum Informat & Quantum P, Hefei 230026, Anhui, Peoples R China

[11] Hokkaido Univ, Grad Sch Chem Sci & Engn, Sapporo, Hokkaido 0600810, Japan

来源：

NATURE COMMUNICATIONS | 2017年 / 8卷

基金：

欧洲研究理事会; 中国国家自然科学基金;

关键词：

HIGH-TEMPERATURE SUPERCONDUCTIVITY; ARSENIDE SUPERCONDUCTOR; ELECTRONIC-STRUCTURE; TRANSITION; KFE2AS2; ORDER;

D O I：

10.1038/s41467-017-02016-y

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Nematic order often breaks the tetragonal symmetry of iron-based superconductors. It arises from regular structural transition or electronic instability in the normal phase. Here, we report the observation of a nematic superconducting state, by measuring the angular dependence of the in-plane and out-of-plane magnetoresistivity of Ba0.5K0.5Fe2As2 single crystals. We find large twofold oscillations in the vicinity of the superconducting transition, when the direction of applied magnetic field is rotated within the basal plane. To avoid the influences from sample geometry or current flow direction, the sample was designed as Corbino-shape for in-plane and mesa-shape for out-of-plane measurements. Theoretical analysis shows that the nematic superconductivity arises from the weak mixture of the quasi-degenerate s-wave and d-wave components of the superconducting condensate, most probably induced by a weak anisotropy of stresses inherent to single crystals.

引用

页数：8

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