Nodeless superconductivity in a quasi-two-dimensional superconductor AuTe2Se4/3

doi:10.1088/1674-1056/27/6/067401

中国物理B ›› 2018, Vol. 27 ›› Issue (6): 67401-067401.doi: 10.1088/1674-1056/27/6/067401

• SPECIAL TOPIC—Recent advances in thermoelectric materials and devices • 上一篇下一篇

Nodeless superconductivity in a quasi-two-dimensional superconductor AuTe₂Se_4/3

Xiao-Yu Jia(贾小雨), Yun-Jie Yu(俞云杰), Xu Chen(陈旭), Jian-Gang Guo(郭建刚), Tian-Ping Ying(应天平), Lan-Po He(何兰坡), Xiao-Long Chen(陈小龙), Shi-Yan Li(李世燕)

1 State Key Laboratory of Surface Physics, Department of Physics, and Laboratory of Advanced Materials, Fudan University, Shanghai 200433, China;
2 Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
3 School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China;
4 Collaborative Innovation Center of Quantum Matter, Beijing 100084, China;
5 Collaborative Innovation Center of Advanced Microstructures, Nanjing 210093, China

收稿日期:2018-04-16 修回日期:2018-04-24 出版日期:2018-06-05 发布日期:2018-06-05
通讯作者: Shi-Yan Li E-mail:shiyan_li@fudan.edu.cn
基金资助:
Project supported by the Key Basic Research Program of China (Grant Nos.2015CB921401 and 2016YFA0300503),the National Natural Science Foundation of China (Grant Nos.11422429 and 11421404),China Postdoctoral Science Foundation (Grant No.2016T90332),the Program for Professor of Special Appointment (Eastern Scholar) at Shanghai Institutions of Higher Learning,and STCSM of China (Grant No.15XD1500200),and the Strategic Priority Research Program (B) of the Chinese Academy of Sciences (Grant No.XDB04040200).

Nodeless superconductivity in a quasi-two-dimensional superconductor AuTe₂Se_4/3

Xiao-Yu Jia(贾小雨)¹, Yun-Jie Yu(俞云杰)¹, Xu Chen(陈旭)², Jian-Gang Guo(郭建刚)², Tian-Ping Ying(应天平)¹, Lan-Po He(何兰坡)¹, Xiao-Long Chen(陈小龙)^2,3,4, Shi-Yan Li(李世燕)^1,5

1 State Key Laboratory of Surface Physics, Department of Physics, and Laboratory of Advanced Materials, Fudan University, Shanghai 200433, China;
2 Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
3 School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China;
4 Collaborative Innovation Center of Quantum Matter, Beijing 100084, China;
5 Collaborative Innovation Center of Advanced Microstructures, Nanjing 210093, China

Received:2018-04-16 Revised:2018-04-24 Online:2018-06-05 Published:2018-06-05
Contact: Shi-Yan Li E-mail:shiyan_li@fudan.edu.cn
Supported by:
Project supported by the Key Basic Research Program of China (Grant Nos.2015CB921401 and 2016YFA0300503),the National Natural Science Foundation of China (Grant Nos.11422429 and 11421404),China Postdoctoral Science Foundation (Grant No.2016T90332),the Program for Professor of Special Appointment (Eastern Scholar) at Shanghai Institutions of Higher Learning,and STCSM of China (Grant No.15XD1500200),and the Strategic Priority Research Program (B) of the Chinese Academy of Sciences (Grant No.XDB04040200).

摘要/Abstract

摘要：

We performed ultra-low temperature thermal conductivity measurements on the single crystal of a new gold-based quasi-two-dimensional superconductor AuTe₂Se_4/3, which has a superconducting transition temperature T_c=2.70 K. A negligible residual linear term κ₀/T in zero magnetic field is observed, which suggests fully gapped superconducting state. Furthermore, the field dependence of κ₀/T is similar to that of the multi-band s-wave superconductor BaFe_1.9Ni_0.1As₂ at low field. These results reveal multiple nodeless superconducting gaps in this interesting quasi-two-dimensional superconductor with Berezinsky-Kosterlitz-Thouless topological transition.

关键词: superconductivity, thermal transport measurement, gap structure, two-dimensional material

Abstract:

Key words: superconductivity, thermal transport measurement, gap structure, two-dimensional material

中图分类号: (Electric and thermal conductivity)

74.25.fc

74.25.Jb (Electronic structure (photoemission, etc.)) 74.25.Op (Mixed states, critical fields, and surface sheaths) 74.70.Dd (Ternary, quaternary, and multinary compounds)

贾小雨, 俞云杰, 陈旭, 郭建刚, 应天平, 何兰坡, 陈小龙, 李世燕. Nodeless superconductivity in a quasi-two-dimensional superconductor AuTe₂Se_4/3[J]. 中国物理B, 2018, 27(6): 67401-067401.

Xiao-Yu Jia(贾小雨), Yun-Jie Yu(俞云杰), Xu Chen(陈旭), Jian-Gang Guo(郭建刚), Tian-Ping Ying(应天平), Lan-Po He(何兰坡), Xiao-Long Chen(陈小龙), Shi-Yan Li(李世燕). Nodeless superconductivity in a quasi-two-dimensional superconductor AuTe₂Se_4/3[J]. Chin. Phys. B, 2018, 27(6): 67401-067401.

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Nodeless superconductivity in a quasi-two-dimensional superconductor AuTe₂Se_4/3

Nodeless superconductivity in a quasi-two-dimensional superconductor AuTe₂Se_4/3

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