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

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

2011-06-06

arxiv.org/abs/1106.0991v1

Applied Physics Letters 94 (20), 202102, 2009

Physics

Condensed Matter

Strongly Correlated Electrons

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

Scientific paper

10.1063/1.3122926

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.

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