Anisotropic multiband superconductivity in 2 M − WS 2 probed by controlled disorder

Ghimire, Sunil; Joshi, Kamal R.; Kończykowski, Marcin; Grasset, Romain; Datta, Amlan; Tanatar, Makariy A.; Bérubé, Damien; Xu, Su-Yang; Fang, Yuqiang; Huang, Fuqiang; Orth, Peter P.; Scheurer, Mathias S.; Prozorov, Ruslan

doi:10.1103/PhysRevResearch.6.013124

Anisotropic multiband superconductivity in $2 M − {WS}_{2}$ probed by controlled disorder

Journal Article · Wed Jan 31 04:00:00 EST 2024 · Physical Review Research

DOI:https://doi.org/10.1103/PhysRevResearch.6.013124· OSTI ID:2283457

; ; ; ; ; ; ; Xu, Su-Yang; Fang, Yuqiang; Huang, Fuqiang; ; ;

The intrinsically superconducting Dirac semimetal $2 M − {WS}_{2}$ is a promising candidate for realizing proximity-induced topological superconductivity in its protected surface states. A precise characterization of the bulk superconducting state is essential to understand the nature of surface superconductivity in the system. Here, we report a detailed experimental study of the temperature-dependent London penetration depth, $λ (T)$ , the upper critical field, $H_{c 2} (T)$ , and the effects of nonmagnetic disorder on these quantities, as well as on the superconducting transition temperature $T_{c}$ in single crystals of $2 M − {WS}_{2}$ . We observe a power-law variation of $λ (T) \propto T^{3}$ at temperatures below $0.35 T_{c}$ . Nonmagnetic pointlike disorder induced by 2.5 MeV electron irradiation at various doses results in a significant suppression of $T_{c}$ . These observations are markedly different from expectations for a fully gapped isotropic $s − wave$ superconductor. Together with the substantial increase of slope, $d H_{c 2} {/ d T |}_{T = T_{c}}$ , with increasing disorder, our results suggest a strongly anisotropic $s^{+ +}$ multiband superconducting state. These results have direct consequences for the expected proximity-induced superconductivity of the topological surface states.

Published by the American Physical Society 2024

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Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: NONE; AC02-07CH11358

OSTI ID:: 2283457

Alternate ID(s):: OSTI ID: 2305612

Journal Information:: Physical Review Research, Journal Name: Physical Review Research Journal Issue: 1 Vol. 6; ISSN PPRHAI; ISSN 2643-1564

Publisher:: American Physical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Anisotropic multiband superconductivity in 2 M − WS 2 probed by controlled disorder

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Anisotropic multiband superconductivity in $2 M − {WS}_{2}$ probed by controlled disorder