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A single crystal monolith of La0.9Sr0.1FeO3 and thin pulsed laser depositedfilm of La0.8Sr0.2Fe0.8Ni0.2O3 were subject to angle integrated valence bandphotoemission spectroscopy in ultra high vacuum and conductivity experiments inambient air at temperatures from 300 K to 800 K. Except for several sputteringand annealing cycles, the specimen were not prepared in-situ.. Peculiar changesin the temperature dependent, bulk representative conductivity profile as aresult of reversible phase transitions, and irreversible chemical changes aresemi-quantitatively reflected by the intensity variation in the more surfacerepresentative valence band spectra near the Fermi energy. X-ray photoelectrondiffraction images reflect the symmetry as expected from bulk iron perovskites.The correlation of spectral details in the valence band photoemission spectra(VB PES) and details of the conductivity during temperature variation suggestthat valuable information on electronic structure and transport properties ofcomplex materials may be obtained without in-situ preparation.

journal of electron spectroscopy and related phenomena

Correlation of conductivity and angle integrated valence band  photoemission characteristics in single crystal iron perovskites for 300 K <  T < 800 K: Comparison of surface and bulk sensitive methods