Core photoemission spectra of oxygen atoms in perovskite manganites La 1−x A x MnO 3 (A=Sr, Pb)

Abstract

The electronic structure of the colossal magnetoresistance perovskite manganite materials, La 0.65 Pb 0.35 MnO 3 and La 0.7 Sr 0.3 MnO 3, has been studied by X-ray photoemission spectroscopy (XPS). The 1s core level spectra of oxygen (O(1s)) exhibit double-peak structure with asymmetric intensities characteristic for different chemical environments. Ab-initio calculations allow identifying source of the peaks. The higher peak in the lower binding energy is associated with ten of oxygen atoms, and the rest of oxygen atoms (two) give the weaker peak in the higher binding energy part of the XPS spectra. The weaker peak is associated only with these two oxygen atoms which are located in the lanthanum atoms plane without Sr or Pb impurities.