Anisotropic superconducting gap probed by $^{125}$Te NMR in noncentrosymmetric Sc$_6M$Te$_2$ ($M$ = Fe, Co)
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arXiv
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| Autores principales: | , , , , , , , , |
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| Formato: | Preprint |
| Publicado: |
2025
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| _version_ | 1866908391437238272 |
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| author | Doi, Kanako Takei, Hayase Shinoda, Yusaku Okamoto, Yoshihiko Hirai, Daigorou Takenaka, Koshi Matsushita, Taku Kobayashi, Yoshiaki Shimizu, Yasuhiro |
| author_facet | Doi, Kanako Takei, Hayase Shinoda, Yusaku Okamoto, Yoshihiko Hirai, Daigorou Takenaka, Koshi Matsushita, Taku Kobayashi, Yoshiaki Shimizu, Yasuhiro |
| contents | The superconducting gap symmetry is investigated by $^{125}$Te NMR measurements on Sc$_6M$Te$_2$ ($M$ = Fe, Co) without spatial inversion symmetry. The spin susceptibility obtained from the Knight shift $K$ is suppressed below the superconducting transition temperature, while leaving a finite value down to the lowest temperature ($\simeq 0.4$ K). The nuclear spin-lattice relaxation rate $1/T_1$ follows a power law against temperature $T$ without showing a coherence peak characteristic of the isotropic gap. The result implies a pairing admixture or a residual density of states under magnetic field. The normal metallic state has a Korringa scaling relation between $1/T_1T$ and the Knight shift, reflecting a weak electron correlation. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2506_02484 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Anisotropic superconducting gap probed by $^{125}$Te NMR in noncentrosymmetric Sc$_6M$Te$_2$ ($M$ = Fe, Co) Doi, Kanako Takei, Hayase Shinoda, Yusaku Okamoto, Yoshihiko Hirai, Daigorou Takenaka, Koshi Matsushita, Taku Kobayashi, Yoshiaki Shimizu, Yasuhiro Superconductivity The superconducting gap symmetry is investigated by $^{125}$Te NMR measurements on Sc$_6M$Te$_2$ ($M$ = Fe, Co) without spatial inversion symmetry. The spin susceptibility obtained from the Knight shift $K$ is suppressed below the superconducting transition temperature, while leaving a finite value down to the lowest temperature ($\simeq 0.4$ K). The nuclear spin-lattice relaxation rate $1/T_1$ follows a power law against temperature $T$ without showing a coherence peak characteristic of the isotropic gap. The result implies a pairing admixture or a residual density of states under magnetic field. The normal metallic state has a Korringa scaling relation between $1/T_1T$ and the Knight shift, reflecting a weak electron correlation. |
| title | Anisotropic superconducting gap probed by $^{125}$Te NMR in noncentrosymmetric Sc$_6M$Te$_2$ ($M$ = Fe, Co) |
| topic | Superconductivity |
| url | https://arxiv.org/abs/2506.02484 |