X-ray absorption spectroscopy studies of La1-xSrxFeO3

We report the Fe K-edge and La L-2,L-3-edge x-ray absorption spectroscopy ( XAS) studies of a series of La1-xSrxFeO3 samples. The chemical shift and th e pre-edge feature strength of Fe K-edge spectra show that both the Fe vale nce and its 3d holes increase with Sr concentration up to x = 0.8 then satu rate. Systematic variations in the whiteline intensity and the above-edge f eature in the La L-2,L-3-edge XAS spectra with Sr concentration indicate th at the local structure and the electronic state of La are both affected by Sr doping. The correlation between the Fe valence change and the structural variation are briefly discussed.