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

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

Journal Article · Wed Jan 31 00:00:00 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 2M-WS₂ is a promising candidate for realizing proximityinduced 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_c2 (T), and the effects of nonmagnetic disorder on these quantities, as well as on the superconducting transition temperature T_c in single crystals of 2M-WS₂. We observe a power-law variation of λ(T) ∝ T³ at temperatures below 0.35T_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, dH_c2/dT |_{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.

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Research Organization:: Ames Laboratory (AMES), Ames, IA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE); LabEx PALM

Grant/Contract Number:: AC02-07CH11358; ANR-10-LABX-0039-PALM

OSTI ID:: 2283457

Alternate ID(s):: OSTI ID: 2305612

Report Number(s):: IS-J-11,259; PPRHAI; 013124

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

Publisher:: American Physical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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