Hybridization and suppression of superconductivity in CeFeAsO1-y : Pressure and temperature dependence of the electronic structure

Yamaoka, Hitoshi; Jarrige, Ignace; Ikeda-Ohno, Atsushi; Tsutsui, Satoshi; Lin, Jung-Fu; Takeshita, Nao; Miyazawa, Kiichi; Iyo, Akira; Kito, Hijiri; Eisaki, Hiroshi; Hiraoka, Nozumu; Ishii, Hirofumi; Tsuei, Ku-Ding

doi:10.1103/PhysRevB.82.125123

Hybridization and suppression of superconductivity in ${CeFeAsO}_{1 - y}$ : Pressure and temperature dependence of the electronic structure

Journal Article · Wed Sep 01 04:00:00 EDT 2010 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PhysRevB.82.125123· OSTI ID:1380586

Yamaoka, Hitoshi; Jarrige, Ignace; Ikeda-Ohno, Atsushi; Tsutsui, Satoshi; Lin, Jung-Fu; Takeshita, Nao; Miyazawa, Kiichi; Iyo, Akira; Kito, Hijiri; Eisaki, Hiroshi; Hiraoka, Nozumu; Ishii, Hirofumi; Tsuei, Ku-Ding

Pressure and temperature dependence of the electronic structure of superconducting (SC) CeFeAsO 1 - y and non-SC CeFeAsO 1 - y have been investigated using two complementary hard x-ray spectroscopic probes at the Ce L 3 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 f 0 ( Ce 4 + ) state and that of the f 1 ( Ce 3 + ) state, I ( f 0 ) / I ( f 1 ) , is found to increase continuously for both compounds, indicating a continuous increase in the Ce valence. The valence of non-SC CeFeAsO 1 - y is found to be slightly higher than that of SC CeFeAsO 1 - y in the entire pressure and temperature ranges of this study. The valence of CeFeAsO 1 - 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.

Research Organization:: Energy Frontier Research Centers (EFRC) (United States). Energy Frontier Research in Extreme Environments (EFree)

Sponsoring Organization:: USDOE SC Office of Basic Energy Sciences (SC-22)

DOE Contract Number:: SC0001057

OSTI ID:: 1380586

Journal Information:: Physical Review. B, Condensed Matter and Materials Physics, Journal Name: Physical Review. B, Condensed Matter and Materials Physics Journal Issue: 12 Vol. 82; ISSN 1098-0121; ISSN PRBMDO

Publisher:: American Physical Society (APS)

Country of Publication:: United States

Language:: English

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