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 · Physical Review B
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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.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| WS2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 8.8 | Pressure unresolved | onset |
| WS2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 8.7 | Pressure unresolved | zero_resistance |
| WS2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 8.8 | Pressure unresolved | onset |
| WS2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 8.8 | Pressure unresolved | onset |
| Sr2RuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| Tl2Ba2CuO6+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 15 | Pressure not reported | unknown |
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