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Bulk superconductivity in Pb-substituted BiS\(_{\bf 2}\)-based compounds studied by hard-x-ray spectroscopy

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. Usin...

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Published in:arXiv.org 2024-01
Main Authors: 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
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Language:English
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Summary: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.
ISSN:2331-8422
DOI:10.48550/arxiv.2305.19622