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Core-level electronic structure of La1-xSrxMnO3 has been studied by x-rayphotoemission spectroscopy (XPS). We first report, by the conventional XPS, thewell-screened shoulder structure in Mn 2p3/2 peak, which had been observed onlyby hard x-ray photoemission spectroscopy so far. Multiple-peak analysisrevealed that the Mn4+ spectral weight was not proportional to the nominal holeconcentration x, indicating that a simple Mn3+/Mn4+ intensity ratio analysismay result in a wrong quantitative elemental analysis. Considerable weight ofthe shoulder at x=0.0 and the fact that the shoulder weight was even slightlygoing down from x=0.2 to 0.4 were not compatible with the idea that this weightsimply represents the metallic behavior. Further analysis found that the wholeMn 2p3/2 peak can be decomposed into four portions, the Mn4+, the (nominal)Mn3+, the shoulder, and the other spectral weight located almost at the Mn3+location. We concluded that this weight represents the well-screened finalstate at Mn4+ sites, whereas the shoulder is known as that of the Mn3+ states.We found that the sum of these two spectral weight has an empiricalrelationship to the conductivity evolution with x.

Hidden relationship between the electrical conductivity and the Mn 2p core-level photoemission spectra in La1-xSrxMnO3