Direct evidence for electron hole depletion in La0.5Sr0.5FeO3-d upon B-site cation doping

Artur Braun; Defne Bayraktar; Ashley S. Harvey; Daniel Beckel; John A. Purton; Peter Holtappels; Ludwig J. Gauckler; Thomas Graule

doi:10.1063/1.3122926

Direct evidence for electron hole depletion in La0.5Sr0.5FeO3-d upon B-site cation doping

Strongly Correlated Electrons 2011-06-07 v1 Materials Science

Authors: Artur Braun , Defne Bayraktar , Ashley S. Harvey , Daniel Beckel , John A. Purton , Peter Holtappels , Ludwig J. Gauckler , Thomas Graule

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Abstract

Partial substitution of Fe by Ta in the hole-doped La0.5Sr0.5FeO3 decreases the electric conductivity by up to three orders of magnitude. This decrease is in immediate correlation with a decrease of the electron hole concentration and a shift of the spectral weight within the O(1s)-Fe(3d) mixed states from eg bands near the Fermi energy to t2g bands. Corresponding differences in the Fe(2p) and O(1s) X-ray absorption spectra reveals formation of states with increased covalency in the initial state and states which contain O(2p) character, and that hole states are responsible for transport changes in the material. The intensity ratio of eg and t2g bands appears to be a spectral indicator for hole formation.

Keywords

electron hole depletion B-site cation doping La0.5Sr0.5FeO3 X-ray absorption spectroscopy eg and t2g bands electrical conductivity covalency

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@article{arxiv.1106.0991,
  title  = {Direct evidence for electron hole depletion in La0.5Sr0.5FeO3-d upon B-site cation doping},
  author = {Artur Braun and Defne Bayraktar and Ashley S. Harvey and Daniel Beckel and John A. Purton and Peter Holtappels and Ludwig J. Gauckler and Thomas Graule},
  journal= {arXiv preprint arXiv:1106.0991},
  year   = {2011}
}

Comments

PACS numbers: 71.27.+a, 71.30.+h, 71.38.-k, 72.10.Fk, 78.70.Dm

Direct evidence for electron hole depletion in La0.5Sr0.5FeO3-d upon B-site cation doping

Abstract

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