X-ray photoelectron spectroscopy study of (Ca1−xLax)MnO2.97 (0.1 ≦ x ≦ 0.4)

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Abstract The X-ray photoelectron spectroscopy (XPS) of perovskite-type (Ca1−xLax)MnO2.97 (0.1 ≦ x ≦ 0.4) was measured at room temperature. From the absolute values of the binding energy difference (ΔBE) of Ca2pO1s, La3dO1s, and Mn2pO1s, both the chemical bonding of MnO and CaO become more covalent, and that of LaO becomes more ionic with increasing x. The electron transfer of the MnOMn path is dominant, and the electrical properties are strongly influenced by the decrease of the electron transfer of the MnO(Ca,La)OMn path.

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