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タイトル: | Penetration depth and gap structure in the antiperovskite oxide superconductor Sr₃₋xSnO revealed by μSR |
著者: | Ikeda, Atsutoshi https://orcid.org/0000-0002-9345-2967 (unconfirmed) Guguchia, Zurab Oudah, Mohamed Koibuchi, Shun Yonezawa, Shingo https://orcid.org/0000-0002-7476-3604 (unconfirmed) Das, Debarchan Shiroka, Toni Luetkens, Hubertus Maeno, Yoshiteru |
著者名の別形: | 池田, 敦俊 鯉渕, 駿 米澤, 進吾 前野, 悦輝 |
発行日: | 4-May-2020 |
出版者: | American Physical Society (APS) |
誌名: | Physical Review B |
巻: | 101 |
号: | 17 |
論文番号: | 174503 |
抄録: | We report a μSR study on the antiperovskite oxide superconductor Sr₃₋xSnO. By using transverse-field μSR, we observed an increase of the muon relaxation rate upon cooling below the superconducting transition temperature Tc = 5.4K, evidencing bulk superconductivity. The exponential temperature dependence of the relaxation rate σ at low temperatures suggests a fully gapped superconducting state. We evaluated the zero-temperature penetration depth λ(0)∝1/√σ(0) to be around 320–1020 nm. Such a large value is consistent with the picture of a doped Dirac semimetal. Moreover, we established that the ratio Tc/λ(0)⁻² is larger than those of ordinary superconductors and is comparable to those of unconventional superconductors. The relatively high Tc for small carrier density may hint at an unconventional pairing mechanism beyond the ordinary phonon-mediated pairing. In addition, zero-field μSR did not provide evidence of broken time-reversal symmetry in the superconducting state. These features are consistent with the theoretically proposed topological superconducting state in Sr₃₋xSnO, as well as with ordinary s-wave superconductivity. |
著作権等: | ©2020 American Physical Society |
URI: | http://hdl.handle.net/2433/250921 |
DOI(出版社版): | 10.1103/PhysRevB.101.174503 |
出現コレクション: | 学術雑誌掲載論文等 |
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