Fully gapped superconducting state in Au2Pb: A natural candidate for topological superconductor

被引：6

作者：

Yu, Y. J. ^{[1
,2
]}

Xu, Y. ^{[1
,2
]}

Xing, Y. ^{[3
,4
,5
]}

Zhang, J. ^{[1
,2
]}

Ying, T. P. ^{[1
,2
]}

Hong, X. C. ^{[1
,2
]}

Wang, M. X. ^{[1
,2
]}

Zhang, X. ^{[3
,5
]}

Jia, S. ^{[3
,5
]}

Wang, J. ^{[3
,5
]}

Li, S. Y. ^{[1
,2
,6
]}

机构：

[1] Fudan Univ, Dept Phys, State Key Lab Surface Phys, Shanghai 200433, Peoples R China

[2] Fudan Univ, Lab Adv Mat, Shanghai 200433, Peoples R China

[3] Peking Univ, Sch Phys, Int Ctr Quantum Mat, Beijing 100871, Peoples R China

[4] China Univ Petr, Beijing Key Lab Opt Detect Technol Oil & Gas, Beijing 102249, Peoples R China

[5] Collaborat Innovat Ctr Quantum Matter, Beijing 100871, Peoples R China

[6] Collaborat Innovat Ctr Adv Microstruct, Nanjing 210093, Jiangsu, Peoples R China

来源：

EPL | 2016年 / 116卷 / 06期

关键词：

D O I：

10.1209/0295-5075/116/67002

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We measured the ultra-low-temperature specific heat and thermal conductivity of the Au2Pb single crystal, a possible three-dimensional Dirac semimetal with a superconducting transition temperature Tc approximate to 1.05 K. The electronic specific heat can be fitted by a two-band s-wave model, which gives the gap amplitudes Delta(1)(0)/k(B)T(c) - 1.41 and Delta(2)(0)/k(B)T(c) - 5.25. From the thermal conductivity measurements, a negligible residual linear term kappa(0)/T in zero field and a slow field dependence of kappa(0)/T at low field are obtained. These results suggest that Au2Pb has a fully gapped superconducting state in the bulk, which is a necessary condition for topological superconductors if Au2Pb is indeed one. Copyright (C) EPLA, 2016

引用

页数：6

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