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arxiv cond-mat/0104371 v2 pith:WJSFTIXB submitted 2001-04-19 cond-mat.supr-con

X-ray Photoemission Study of the Infinite-Layer Cuprate Superconductor Sr0.9La0.1CuO2

R. P. Vasquez , C. U. Jung , J. Y. Kim , Min-Seok Park , Heon-Jung Kim , Sung-Ik Lee This is my paper
classification cond-mat.supr-con
keywords superconductorcuo2electron-dopedhole-dopedinfinite-layerphotoemissionx-rayband
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The electron-doped infinite-layer superconductor Sr0.9La0.1CuO2 is studied with x-ray photoemission spectroscopy (XPS). A nonaqueous chemical etchant is shown to effectively remove contaminants and to yield surfaces from which signals intrinsic to the superconductor dominate. These data are compared to measurements from hole-doped La1.85Sr0.15CuO4, from undoped La2CuO4, and from electron-doped Nd1.85Ce0.15CuO4-d. The Cu 2p core level is consistent with a lower value of the O 2p to Cu 3d charge transfer energy D than in hole-doped cuprates. A clear Fermi edge is observed in the valence band region.

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