2004/04/19 by Hiroki Wadati, H. Wadati, D. Kobayashi +17 · 1 citation
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Electronic and Structural Properties of Oxides #Magnetic and transport properties of perovskites and related materials #cond-mat.mtrl-sci #cond-mat.str-el
paper · pdf · doi:10.1103/physrevb.71.035108
published as Phys. Rev. B 71, 035108 (2005) · 8 pages, 7 figures
arxiv created 2004/04/19 · openalex publication_date 2005/01/20 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
We have studied the electronic structure of epitaxially grown thin films of La_1\ensuremath-xSrxFeO3 by in situ photoemission spectroscopy (PES) and x-ray-absorption spectroscopy (XAS) measurements. The Fe 2p and valence-band PES spectra and the O 1s XAS spectra of LaFeO3 have been successfully reproduced by configuration-interaction cluster-model calculation and, except for the satellite structure, by band-structure calculation. From the shift of the binding energies of core levels, the chemical potential was found to be shifted downward as x was increased. Among the three peaks in the valence-band spectra of La_1\ensuremath-xSrxFeO3, the peak nearest to the Fermi level (EF), due to the ``eg band,'' was found to move toward EF and became weaker as x was increased, whereas the intensity of the peak just above EF in the O 1s XAS spectra increased with x. The gap at EF was seen for all values of x. These results indicate that changes in the spectral line shape around EF are dominated by spectral weight transfer from below to above EF across the gap and are therefore highly nonrigid-bandlike changes.