Temperature, doping, and polarization effects on Bi 6p and S 3p states in the BiS2-layered superconductor LaO1−xFxBiS2
Y. Y. Chin, H.-J. Lin, Z. Hu, Masanori Nagao, Yongping Du, Xiangang Wan, B.-J. Su, L. Y. Jang, T. S. Chan, H.-Y. Chen, Y. L. Soo, C. T. Chen
DOI 10.1103/PhysRevB.94.035150 · Physical Review B
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Abstract
The x-ray absorption spectra at the Bi-L1 and S-K edges of LaO1−xFxBiS2 show a decrease of spectral weight close to the absorption thresholds upon F substitution for O, indicating a reduction of the unoccupied Bi 6p and S 3p states, as expected for electron doping. This doping-induced spectral weight transfer at the S-K edge is similar to the electron-doped cuprate superconductor, Nd2−xCexCuO4, but the polarization-dependent XAS spectra of LaO0.54F0.46BiS2 at the S-K edge is very different from those of Nd2−xCexCuO4 at the O-K edge, reflecting different constitution of valence electrons. We found that one-electron band structure calculations cannot describe our experimental S-K XAS spectra of LaO1−xFxBiS2, suggesting possible correlation effects for p electrons, which is important in transition metal compounds with the dominating d electrons.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| LaO0.54F0.46BiS2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 3 | Pressure not reported | unknown |
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