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

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 2M-WS2

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

Research output: Contribution to journal › Article › peer-review

22 Scopus citations

Abstract

Recently, a new transition-metal dichalcogenide (TMD) material 2M-phase WS2 was synthesized. The material 2M-WS2 not only exhibits superconductivity, with the highest Tc 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 2M-WS2 single crystals to investigate its superconducting gap structure. A negligible residual linear term κ0/T in zero field shows that 2M-WS2 has a fully superconducting gap with all electrons paired. The field dependence of κ0/T suggests an anisotropic superconducting gap or multiple nodeless superconducting gaps in 2M-WS2. Such a fully gapped superconducting state is compatible with 2M-WS2 being a topological superconductor candidate.

Original language	English
Article number	024523
Journal	Physical Review B
Volume	102
Issue number	2
DOIs	https://doi.org/10.1103/PhysRevB.102.024523
State	Published - 1 Jul 2020
Externally published	Yes

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title = "Nodeless superconducting gap in the topological superconductor candidate 2M-WS2",

abstract = "Recently, a new transition-metal dichalcogenide (TMD) material 2M-phase WS2 was synthesized. The material 2M-WS2 not only exhibits superconductivity, with the highest Tc 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 2M-WS2 single crystals to investigate its superconducting gap structure. A negligible residual linear term κ0/T in zero field shows that 2M-WS2 has a fully superconducting gap with all electrons paired. The field dependence of κ0/T suggests an anisotropic superconducting gap or multiple nodeless superconducting gaps in 2M-WS2. Such a fully gapped superconducting state is compatible with 2M-WS2 being a topological superconductor candidate.",

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doi = "10.1103/PhysRevB.102.024523",

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AU - Wang, L. S.

AU - Fang, Y. Q.

AU - Huang, Y. Y.

AU - Cheng, E. J.

AU - Ni, J. M.

AU - Pan, B. L.

AU - Xu, Y.

AU - Huang, F. Q.

AU - Li, S. Y.

PY - 2020/7/1

Y1 - 2020/7/1

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AB - Recently, a new transition-metal dichalcogenide (TMD) material 2M-phase WS2 was synthesized. The material 2M-WS2 not only exhibits superconductivity, with the highest Tc 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 2M-WS2 single crystals to investigate its superconducting gap structure. A negligible residual linear term κ0/T in zero field shows that 2M-WS2 has a fully superconducting gap with all electrons paired. The field dependence of κ0/T suggests an anisotropic superconducting gap or multiple nodeless superconducting gaps in 2M-WS2. Such a fully gapped superconducting state is compatible with 2M-WS2 being a topological superconductor candidate.

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

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