Bulk superconductivity in Pb-substituted BiS$_{\bf 2}$-based compounds studied by hard-x-ray spectroscopy
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arXiv
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| Auteurs principaux: | , , , , , , , , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2023
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| _version_ | 1866916095738249216 |
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| author | Yamasaki, A. Oguni, T. Hayashida, T. Miyazaki, K. Tanaka, N. Nakagawa, K. Tamura, K. Mimura, K. Kawamura, N. Fujiwara, H. Nozue, G. Ose, A. Kanai-Nakata, Y. Higashiya, A. Hamamoto, S. Tamasaku, K. Yabashi, M. Ishikawa, T. Imada, S. Sekiyama, A. Sakata, H. Demura, S. |
| author_facet | Yamasaki, A. Oguni, T. Hayashida, T. Miyazaki, K. Tanaka, N. Nakagawa, K. Tamura, K. Mimura, K. Kawamura, N. Fujiwara, H. Nozue, G. Ose, A. Kanai-Nakata, Y. Higashiya, A. Hamamoto, S. Tamasaku, K. Yabashi, M. Ishikawa, T. Imada, S. Sekiyama, A. Sakata, H. Demura, S. |
| contents | In this study, we investigate the bulk electronic structure of Pb-substituted LaO$_{0.5}$F$_{0.5}$BiS$_2$ single crystals, using two types of hard-x-ray spectroscopy. High-energy-resolution fluorescence-detected x-ray absorption spectroscopy revealed a spectral change at low temperatures. Using density functional theory (DFT) simulations, we find that the temperature-induced change originates from a structural phase transition, similar to the pressure-induced transition in LaO$_{0.5}$F$_{0.5}$BiS$_2$. This finding suggests that the mechanism of bulk superconductivity induced by Pb substitution is the same as that under high pressure. Furthermore, a novel low-valence state with a mixture of divalent and trivalent Bi ions is discovered using hard x-ray photoemission spectroscopy with the aid of DFT calculations. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2305_19622 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Bulk superconductivity in Pb-substituted BiS$_{\bf 2}$-based compounds studied by hard-x-ray spectroscopy Yamasaki, A. Oguni, T. Hayashida, T. Miyazaki, K. Tanaka, N. Nakagawa, K. Tamura, K. Mimura, K. Kawamura, N. Fujiwara, H. Nozue, G. Ose, A. Kanai-Nakata, Y. Higashiya, A. Hamamoto, S. Tamasaku, K. Yabashi, M. Ishikawa, T. Imada, S. Sekiyama, A. Sakata, H. Demura, S. Superconductivity In this study, we investigate the bulk electronic structure of Pb-substituted LaO$_{0.5}$F$_{0.5}$BiS$_2$ single crystals, using two types of hard-x-ray spectroscopy. High-energy-resolution fluorescence-detected x-ray absorption spectroscopy revealed a spectral change at low temperatures. Using density functional theory (DFT) simulations, we find that the temperature-induced change originates from a structural phase transition, similar to the pressure-induced transition in LaO$_{0.5}$F$_{0.5}$BiS$_2$. This finding suggests that the mechanism of bulk superconductivity induced by Pb substitution is the same as that under high pressure. Furthermore, a novel low-valence state with a mixture of divalent and trivalent Bi ions is discovered using hard x-ray photoemission spectroscopy with the aid of DFT calculations. |
| title | Bulk superconductivity in Pb-substituted BiS$_{\bf 2}$-based compounds studied by hard-x-ray spectroscopy |
| topic | Superconductivity |
| url | https://arxiv.org/abs/2305.19622 |