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    Multigap nodeless superconductivity in the topological semimetal PdTe

    Chengcheng Zhao1,2, Xiangqi Liu3, Jinjin Wang4, Chunqiang Xu5, Baomin Wang5, Wei Xia3,6, Zhenhai Yu3, Xiaobo Jin1, Xu Zhang1 et al.

    Jing Wang1, Dongzhe Dai1, Chengpeng Tu1, Jiaying Nie1, Hanru Wang1, Yihan Jiao1, Daniel Duong7, Silu Huang7, Rongying Jin7, Zhu'an Xu4,8,9,*, Yanfeng Guo3,6,†, Xiaofeng Xu10,‡, and Shiyan Li1,2,11,§

    • 1State Key Laboratory of Surface Physics, Department of Physics, and Laboratory of Advanced Materials, Fudan University, Shanghai 200438, China
    • 2Shanghai Research Center for Quantum Sciences, Shanghai 201315, China
    • 3School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China
    • 4School of Physics, Zhejiang University, Hangzhou 310058, China
    • 5School of Physical Science and Technology, Ningbo University, Ningbo 315211, China
    • 6ShanghaiTech Laboratory for Topological Physics, Shanghai 201210, China
    • 7SmartState Center for Experimental Nanoscale Physics, Department of Physics and Astronomy, University of South Carolina, Columbia, South Carolina 29208, USA
    • 8State Key Laboratory of Silicon and Advanced Semiconductor Materials, Zhejiang University, Hangzhou 310027, China
    • 9Hefei National Laboratory, Hefei 230088, China
    • 10Department of Applied Physics, Zhejiang University of Technology, Hangzhou 310023, China
    • 11Collaborative Innovation Center of Advanced Microstructures, Nanjing 210093, China

    • *zhuan@zju.edu.cn
    • †guoyf@shanghaitech.edu.cn
    • ‡xuxiaofeng@zjut.edu.cn
    • §shiyan_li@fudan.edu.cn

    Phys. Rev. B 109, 174502 – Published 2 May, 2024

    DOI: https://doi.org/10.1103/PhysRevB.109.174502

    Abstract

    Recently, PdTe was identified as a spin-orbit-coupled topological Dirac semimetal and was claimed to exhibit both bulk-nodal and surface-nodeless superconducting gaps. Here we report on ultra-low-temperature thermal-conductivity measurements on PdTe single crystals with Tc = 4.5 K to investigate its superconducting gap structure. It is found that the residual linear term κ0/T is negligible in zero magnetic field. Furthermore, the field dependence of κ0(H)/T exhibits an S-shaped curve. These results suggest that PdTe has multiple nodeless superconducting gaps, which is at odds with the claimed bulk-nodal gap. The reason for the discrepancy is likely that previous angle-resolved photoemission spectroscopy measurements were only performed down to 2 K and cannot observe the smaller nodeless gap. The fully gapped superconducting state in PdTe is compatible with it being a topological superconductor candidate.

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