Hybridization and suppression of the superconductivity in CeFeAsO1-y. Pressure and temperature dependences of the electronic structure
- Inst. of Physical and Chemical Research (RIKEN), Wako (Japan)
- Japan Atomic Energy Agency (JAEA), Hyogo (Japan)
- Japan Synchrotron Radiation Research Inst., Hyogo (Japan)
- Univ. of Texas, Austin, TX (United States)
- National Inst. of Advanced Industrial Science adn Technology (AIST), Ibaraki (Japan); Transformative Research-Project on Iron Pnictides (TRIP), Tokyo (Japan)
- National Inst. of Advanced Industrial Science adn Technology (AIST), Ibaraki (Japan); Transformative Research-Project on Iron Pnictides (TRIP), Tokyo (Japan); Tokyo Univ. of Science, Chiba (Japan)
- National Synchrotron Radiation Research Center, Hsinchu (Taiwan)
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.
- Research Organization:
- Energy Frontier Research Centers (EFRC) (United States). Energy Frontier Research in Extreme Environments (EFree)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- DOE Contract Number:
- SC0001057
- OSTI ID:
- 1065307
- Journal Information:
- Phys. Rev. B, Vol. 82; Related Information: EFree partners with Carnegie Institution of Washington (lead); California Institute of Technology; Colorado School of Mines; Cornell University; Lehigh University; Pennsylvania State University
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
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