Intrinsic surface p-wave superconductivity in layered AuSn4

被引:0
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作者
Wenliang Zhu
Rui Song
Jierui Huang
Qi-Wei Wang
Yuan Cao
Runqing Zhai
Qi Bian
Zhibin Shao
Hongmei Jing
Lujun Zhu
Yuefei Hou
Yu-Hang Gao
Shaojian Li
Fawei Zheng
Ping Zhang
Mojun Pan
Junde Liu
Gexing Qu
Yadong Gu
Hao Zhang
Qinxin Dong
Yifei Huang
Xiaoxia Yuan
Junbao He
Gang Li
Tian Qian
Genfu Chen
Shao-Chun Li
Minghu Pan
Qi-Kun Xue
机构
[1] Shaanxi Normal University,School of Physics and Information Technology
[2] Science and Technology on Surface Physics and Chemistry Laboratory,Institute of Physics and Beijing National Laboratory for Condensed Matter Physics
[3] Chinese Academy of Sciences,National Laboratory of Solid State Microstructures, School of Physics, Collaborative Innovation Center of Advanced Microstructures
[4] Nanjing University,School of Physics
[5] Huazhong University of Science and Technology,School of Physics and Physical Engineering
[6] Institute of Applied Physics and Computational Mathematics,College of Physics and Electronic Engineering
[7] Qufu Normal University,School of Physical Sciences
[8] Shaanxi Applied Physics and Chemistry Research Institute,State Key Laboratory of Low
[9] Nanyang Normal University,Dimensional Quantum Physics, Department of Physics
[10] University of Chinese Academy of Sciences,Department of Physics
[11] Songshan Lake Materials Laboratory,undefined
[12] Tsinghua University,undefined
[13] Beijing Academy of Quantum Information Sciences,undefined
[14] Southern University of Science and Technology,undefined
来源
Nature Communications | / 14卷
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摘要
The search for topological superconductivity (TSC) is currently an exciting pursuit, since non-trivial topological superconducting phases could host exotic Majorana modes. However, the difficulty in fabricating proximity-induced TSC heterostructures, the sensitivity to disorder and stringent topological restrictions of intrinsic TSC place serious limitations and formidable challenges on the materials and related applications. Here, we report a new type of intrinsic TSC, namely intrinsic surface topological superconductivity (IS-TSC) and demonstrate it in layered AuSn4 with Tc of 2.4 K. Different in-plane and out-of-plane upper critical fields reflect a two-dimensional (2D) character of superconductivity. The two-fold symmetric angular dependences of both magneto-transport and the zero-bias conductance peak (ZBCP) in point-contact spectroscopy (PCS) in the superconducting regime indicate an unconventional pairing symmetry of AuSn4. The superconducting gap and surface multi-bands with Rashba splitting at the Fermi level (EF), in conjunction with first-principle calculations, strongly suggest that 2D unconventional SC in AuSn4 originates from the mixture of p-wave surface and s-wave bulk contributions, which leads to a two-fold symmetric superconductivity. Our results provide an exciting paradigm to realize TSC via Rashba effect on surface superconducting bands in layered materials.
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