Nodeless superconducting gap in the topological superconductor candidate <math xmlns="http://www.w3.org/1998/Math/MathML"><mn>2</mn><mi>M</mi><mtext>–</mtext><mi>WS</mi><msub><mrow></mrow><mn>2</mn></msub></math>

L. S. Wang; Y. Q. Fang; Y. Y. Huang; E. J. Cheng; J. M. Ni; B. L. Pan; Y. Xu; F. Q. Huang; S. Y. Li

doi:10.1103/PhysRevB.102.024523

Nodeless superconducting gap in the topological superconductor candidate $2 M – WS_{2}$

L. S. Wang¹, Y. Q. Fang ^2,3, Y. Y. Huang¹, E. J. Cheng¹, J. M. Ni¹, B. L. Pan², Y. Xu ^4,*, F. Q. Huang^2,3,†, and S. Y. Li ^1,5,‡

¹State Key Laboratory of Surface Physics, Department of Physics, and Laboratory of Advanced Materials, Fudan University, Shanghai 200438, China
²State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Science, Shanghai 200050, China
³State Key Laboratory of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
⁴Physik-Institut, Universität Zürich, Winterthurerstrasse 190, CH-8057 Zürich, Switzerland
⁵Collaborative Innovation Center of Advanced Microstructures, Nanjing 210093, China

^*yangxu@physik.uzh.ch
^†huangfq@mail.sic.ac.cn
^‡shiyan_li@fudan.edu.cn

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Phys. Rev. B 102, 024523 – Published 30 July, 2020

DOI: https://doi.org/10.1103/PhysRevB.102.024523

Abstract

Recently, a new transition-metal dichalcogenide (TMD) material $2 M$ -phase ${WS}_{2}$ was synthesized. The material $2 M − {WS}_{2}$ not only exhibits superconductivity, with the highest $T_{c}$ being 8.8 K at ambient pressure among TMDs, but also hosts a topological surface state. Here we report the low-temperature thermal conductivity measurements on $2 M − {WS}_{2}$ single crystals to investigate its superconducting gap structure. A negligible residual linear term $κ_{0} / T$ in zero field shows that $2 M − {WS}_{2}$ has a fully superconducting gap with all electrons paired. The field dependence of $κ_{0} / T$ suggests an anisotropic superconducting gap or multiple nodeless superconducting gaps in $2 M − {WS}_{2}$ . Such a fully gapped superconducting state is compatible with $2 M − {WS}_{2}$ being a topological superconductor candidate.

Physical Review B

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Nodeless superconducting gap in the topological superconductor candidate $2 M – WS_{2}$

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Nodeless superconducting gap in the topological superconductor candidate 2M–WS2

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Nodeless superconducting gap in the topological superconductor candidate $2 M – WS_{2}$