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Title: Hybridization and suppression of superconductivity in CeFeAsO 1 - y : Pressure and temperature dependence of the electronic structure

Abstract

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.

Authors:
; ; ; ; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Energy Frontier Research Centers (EFRC) (United States). Energy Frontier Research in Extreme Environments (EFree)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1380586
DOE Contract Number:  
SC0001057
Resource Type:
Journal Article
Journal Name:
Physical Review. B, Condensed Matter and Materials Physics
Additional Journal Information:
Journal Volume: 82; Journal Issue: 12; 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; Journal ID: ISSN 1098-0121
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; catalysis (heterogeneous); solar (photovoltaic); phonons; thermoelectric; energy storage (including batteries and capacitors); hydrogen and fuel cells; superconductivity; charge transport; mesostructured materials; materials and chemistry by design; synthesis (novel materials)

Citation Formats

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, and Tsuei, Ku-Ding. Hybridization and suppression of superconductivity in CeFeAsO1-y : Pressure and temperature dependence of the electronic structure. United States: N. p., 2010. Web. doi:10.1103/PhysRevB.82.125123.
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. Hybridization and suppression of superconductivity in CeFeAsO1-y : Pressure and temperature dependence of the electronic structure. United States. doi:10.1103/PhysRevB.82.125123.
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, and Tsuei, Ku-Ding. Wed . "Hybridization and suppression of superconductivity in CeFeAsO1-y : Pressure and temperature dependence of the electronic structure". United States. doi:10.1103/PhysRevB.82.125123.
@article{osti_1380586,
title = {Hybridization and suppression of superconductivity in CeFeAsO1-y : Pressure and temperature dependence of the electronic structure},
author = {Yamaoka, Hitoshi and Jarrige, Ignace and Ikeda-Ohno, Atsushi and Tsutsui, Satoshi and Lin, Jung-Fu and Takeshita, Nao and Miyazawa, Kiichi and Iyo, Akira and Kito, Hijiri and Eisaki, Hiroshi and Hiraoka, Nozumu and Ishii, Hirofumi and Tsuei, Ku-Ding},
abstractNote = {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.},
doi = {10.1103/PhysRevB.82.125123},
journal = {Physical Review. B, Condensed Matter and Materials Physics},
issn = {1098-0121},
number = 12,
volume = 82,
place = {United States},
year = {2010},
month = {9}
}

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