Hybridization and suppression of superconductivity in CeFeAsO1−y: Pressure and temperature dependence of the electronic structure
Hitoshi Yamaoka, Ignace Jarrige, Atsushi Ikeda-Ohno, Satoshi Tsutsui, Jung-Fu Lin, Nao Takeshita, Kiichi Miyazawa, Akira Iyo, Hijiri Kito, Hiroshi Eisaki, Nozumu Hiraoka, Hirofumi Ishii, Ku-Ding Tsuei
DOI 10.1103/PhysRevB.82.125123 · Physical Review B
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Abstract
Pressure and temperature dependence of the electronic structure of superconducting (SC) CeFeAsO1−y and non-SC CeFeAsO1−y have been investigated using two complementary hard x-ray spectroscopic probes at the Ce L3 edge, partial fluorescence yield x-ray absorption spectroscopy and resonant x-ray emission spectroscopy. With increasing pressure, the ratio between the intensity of the peak related to the f0 (Ce4+) state and that of the f1 (Ce3+) state, I(f0)/I(f1), is found to increase continuously for both compounds, indicating a continuous increase in the Ce valence. The valence of non-SC CeFeAsO1−y is found to be slightly higher than that of SC CeFeAsO1−y in the entire pressure and temperature ranges of this study. The valence of CeFeAsO1−y around 6 GPa, where the superconductivity breaks down, is estimated to be ∼3.0, but no change in the valence is observed upon cooling. The dependence of the interatomic distances on the concentration of oxygen vacancies is studied via extended absorption fine structure spectroscopy.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| CeFeAsO1-y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 40 | Pressure unresolved | onset |
| CeFeAsO1-y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 40 | Pressure unresolved | onset |
| LaFeAsO0.89F0.11 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 43 | 4 GPa | unknown |
| CeFeAsO0.88F0.12 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| SmFeAsO0.85 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| NdFeAsO1-y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| LiFeAs Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| CeFeAsO0.7F0.3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | 8.6 GPa | unknown |
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