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

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

Abstract

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.

Keywords: superconductivity thermal transport measurement gap structure two-dimensional material

Received: 16 April 2018
Revised: 24 April 2018
Accepted manuscript online:

PACS:	74.25.fc	(Electric and thermal conductivity)
	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)

Fund:

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).

Corresponding Authors: Shi-Yan Li
E-mail: shiyan_li@fudan.edu.cn

Cite this article:

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 2018 Chin. Phys. B 27 067401

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

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