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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 |
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Main Authors: | , , , , , , , , , , , , , , , , , , , , , |
Format: | Article |
Language: | English |
Subjects: | |
Online Access: | Get full text |
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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. |
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ISSN: | 2331-8422 |
DOI: | 10.48550/arxiv.2305.19622 |