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This paper describes the core-level electronic structure of La1-xSrxMnO3 by laboratory x-ray photoelectron spectroscopy (Lab-XPS). For the first time, by Lab-XPS, we have succeeded in observing the shoulder structure in the lower binding energy side of Mn 2p3/2 core-level spectra which has been observed only in the hard x-ray photoelectron spectroscopy (HX-PES). Then Mn 3+ , Mn 4+ , and the shoulder structure on the Mn 2p3/2 are separated by a multi-peak analysis. The result of considering Mn 3+ / Mn 4+ ratio determined by the Sr fraction (x), it was found that a presence of intensity on Mn 2p3/2 spectra other than the above. The peak was identified as the well-screened peak from the Mn 4+ sites, consequently the sum of the well-screened weight of the Mn 3+ sites and Mn 4+ sites was related to the electrical conductivity with x.

journal of surface analysis

Evaluation of electrical conductivity of a perovskite-type oxide La&lt;sub&gt;1-x&lt;/sub&gt;Sr&lt;sub&gt;x&lt;/sub&gt;MnO&lt;sub&gt;3&lt;/sub&gt; by x-ray photoemission spectroscopy