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Electronic Structure of CeFeAsO1-xFx (x=0, 0.11 and 0.12)

Journal Article · · Physical Review B
 [1];  [1];  [2];  [3];  [4];  [1];  [5];  [6];  [5];  [5];  [7];  [5];  [5];  [7]
  1. CNR-INFM, Trieste, Italy
  2. Lawrence Berkeley National Laboratory (LBNL)
  3. University of Rome
  4. Sincrotrone Trieste, Basovizza, Italy
  5. ORNL
  6. Oak Ridge National Laboratory (ORNL)
  7. University of Tennessee, Knoxville (UTK)
+ Show Author Affiliations
We report an extensive study on the intrinsic bulk electronic structure of the high-temperature superconductor CeFeAsO{sub 0.89}F{sub 0.11} and its parent compound CeFeAsO by soft and hard x-ray photoemissions, x-ray absorption, and soft x-ray emission spectroscopies. The complementary surface/bulk probing depth, and the elemental and chemical sensitivity of these techniques allow resolving the intrinsic electronic structure of each element and correlating it with the local structure, which has been probed by extended x-ray absorption fine-structure spectroscopy. The measurements indicate a predominant 4f{sup 1} (i.e., Ce{sup 3+}) initial-state configuration for cerium and an effective valence-band-to-4f charge-transfer screening of the core hole. The spectra also reveal the presence of a small Ce f{sup 0} initial-state configuration, which we assign to the occurrence of an intermediate-valence state. The data reveal a reasonably good agreement with the partial density of states as obtained in standard density-functional calculations over a large energy range. Implications for the electronic structure of these materials are discussed.
Research Organization:
Oak Ridge National Laboratory (ORNL)
Sponsoring Organization:
SC USDOE - Office of Science (SC)
DOE Contract Number:
AC05-00OR22725
OSTI ID:
986852
Journal Information:
Physical Review B, Journal Name: Physical Review B Journal Issue: 1 Vol. 82; ISSN 1098-0121; ISSN 1550-235X
Country of Publication:
United States
Language:
English

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Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ABSORPTION
ARSENIC COMPOUNDS
CERIUM
CERIUM COMPOUNDS
CONFIGURATION
ELECTRONIC STRUCTURE
ENERGY RANGE
FINE STRUCTURE
HIGH-TC SUPERCONDUCTORS
IRON COMPOUNDS
SENSITIVITY
SPECTRA
SPECTROSCOPY