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The electron-doped infinite-layer superconductor Sr0.9La0.1CuO2 is studiedwith x-ray photoemission spectroscopy (XPS). A nonaqueous chemical etchant isshown to effectively remove contaminants and to yield surfaces from whichsignals intrinsic to the superconductor dominate. These data are compared tomeasurements from hole-doped La1.85Sr0.15CuO4, from undoped La2CuO4, and fromelectron-doped Nd1.85Ce0.15CuO4-d. The Cu 2p core level is consistent with alower value of the O 2p to Cu 3d charge transfer energy D than in hole-dopedcuprates. A clear Fermi edge is observed in the valence band region.Comment: 21 pages, 6 figures; minor clarifications added; accepted for Journal  of Physics: Condensed Matte

X-ray photoemission study of the infinite-layer cuprate superconductor Sr0.9La0.1CuO2

X-ray photoemission study of the infinite-layer cuprate superconductor Sr_0.9La_0.1CuO₂