Anisotropic multiband superconductivity in 2M-WS$_{2}$ probed by controlled disorder
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arXiv
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| Autori principali: | , , , , , , , , , , , , |
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| Natura: | Preprint |
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2023
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| _version_ | 1866915036726820864 |
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| author | Ghimire, Sunil Joshi, Kamal R. Konczykowski, Marcin Grasset, Romain Datta, Amlan Tanatar, Makariy A. Berube, Damien Xu, Su-Yang Fang, Yuqiang Huang, Fuqiang Orth, Peter P. Scheurer, Mathias S. Prozorov, Ruslan |
| author_facet | Ghimire, Sunil Joshi, Kamal R. Konczykowski, Marcin Grasset, Romain Datta, Amlan Tanatar, Makariy A. Berube, Damien Xu, Su-Yang Fang, Yuqiang Huang, Fuqiang Orth, Peter P. Scheurer, Mathias S. Prozorov, Ruslan |
| contents | The intrinsically superconducting Dirac semimetal 2M-WS$_{2}$ is a promising candidate to realize proximity-induced topological superconductivity in its protected surface states. A precise characterization of the bulk superconducting state is essential for understanding the nature of surface superconductivity in the system. Here, we perform a detailed experimental study of the temperature and nonmagnetic disorder dependence of the London penetration depth $λ$, the upper critical field $H_{c2}$, and the superconducting transition temperature $T_c$ in 2M-WS$_{2}$. We observe a power-law dependence $λ(T) - λ(0) \propto T^{3}$ at temperatures below $0.35~T_c$, which is remarkably different from the expected exponential attenuation of a fully gapped isotropic $s$-wave superconductor. We then probe the effect of controlled nonmagnetic disorder induced by 2.5 MeV electron irradiation at various doses and find a significant $T_c$ suppression rate. Together with the observed increase of the slope $dH_{c2}/dT|_{T=T_c}$ with irradiation, our results reveal a strongly anisotropic $s^{++}$ multiband superconducting state that takes the same sign on different Fermi sheets. Our results have direct consequences for the expected proximity-induced superconductivity of the topological surface states. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2307_14891 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Anisotropic multiband superconductivity in 2M-WS$_{2}$ probed by controlled disorder Ghimire, Sunil Joshi, Kamal R. Konczykowski, Marcin Grasset, Romain Datta, Amlan Tanatar, Makariy A. Berube, Damien Xu, Su-Yang Fang, Yuqiang Huang, Fuqiang Orth, Peter P. Scheurer, Mathias S. Prozorov, Ruslan Superconductivity The intrinsically superconducting Dirac semimetal 2M-WS$_{2}$ is a promising candidate to realize proximity-induced topological superconductivity in its protected surface states. A precise characterization of the bulk superconducting state is essential for understanding the nature of surface superconductivity in the system. Here, we perform a detailed experimental study of the temperature and nonmagnetic disorder dependence of the London penetration depth $λ$, the upper critical field $H_{c2}$, and the superconducting transition temperature $T_c$ in 2M-WS$_{2}$. We observe a power-law dependence $λ(T) - λ(0) \propto T^{3}$ at temperatures below $0.35~T_c$, which is remarkably different from the expected exponential attenuation of a fully gapped isotropic $s$-wave superconductor. We then probe the effect of controlled nonmagnetic disorder induced by 2.5 MeV electron irradiation at various doses and find a significant $T_c$ suppression rate. Together with the observed increase of the slope $dH_{c2}/dT|_{T=T_c}$ with irradiation, our results reveal a strongly anisotropic $s^{++}$ multiband superconducting state that takes the same sign on different Fermi sheets. Our results have direct consequences for the expected proximity-induced superconductivity of the topological surface states. |
| title | Anisotropic multiband superconductivity in 2M-WS$_{2}$ probed by controlled disorder |
| topic | Superconductivity |
| url | https://arxiv.org/abs/2307.14891 |