Bulk superconductivity in Pb-substituted BiS2-based compounds studied by hard x-ray spectroscopy
A. Yamasaki, T. Oguni, T. Hayashida, K. Miyazaki, N. Tanaka, K. Nakagawa, K. Tamura, K. Mimura, N. Kawamura, H. Fujiwara, G. Nozue, A. Ose, Y. Kanai-Nakata, A. Higashiya, S. Hamamoto, K. Tamasaku, M. Yabashi, T. Ishikawa, S. Imada, A. Sekiyama, H. Sakata, S. Demura
DOI 10.1103/PhysRevB.109.045131 · Physical Review B
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Abstract
In this study, we investigate the bulk electronic structure of Pb-substituted LaO0.5F0.5BiS2 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 LaO0.5F0.5BiS2. This finding suggests that the mechanism of bulk superconductivity induced by Pb substitution is the same as that under high pressure. Furthermore, a 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.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| LaO0.5F0.5Bi1-xPbxS2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 4 | Pressure unresolved | unknown |
| LaO0.5F0.5BiS2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 3 | Pressure unresolved | unknown |
| LaO0.5F0.5BiS2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 11 | Pressure not reported | unknown |
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