Electron hole–phonon interaction, correlation of structure, and conductivity in single crystal La0.9Sr0.1FeO3-δ

Braun, A.; Richter, J.; Harvey, A. S.; Erat, S.; Infortuna, A.; Frei, A.; Pomjakushina, E.; Mun, Bongjin S.; Holtappels, P.; Vogt, U.; Conder, K.; Gauckler, L. J.; Graule, T.
December 2008
Applied Physics Letters;12/29/2008, Vol. 93 Issue 26, p262103
Academic Journal
The conductivity and structure of the hole-doped polaron conductor La0.9Sr0.1FeO3-δ are reported for elevated temperatures. The conductivity increases exponentially with temperature to a maximum and decreases for T>700 K following a power law, accompanied by a shift of spectral weight in the photoemission valence band. The conductivity decrease is accompanied by a phase transformation, due to the reduction of Fe, as evidenced by x-ray absorption spectra. Additional fine structures in the conductivity are correlated with a strong decrease in valence band intensity near EF and with the onset of a corresponding structural transition.


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