Non-superconducting and rendered superconducting YBa2Cu3O7−x
. An in-situ photoemission study |
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| Authors: | B Dauth P Sen B Rupp W Gudat Ch Ziegler W Göpel |
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| Institution: | (1) Institut für Festkörperforschung der KFA Jülich, D-5170 Jülich, Federal Republic of Germany;(2) Institut für Physikalische und Theoretische Chemie, Universität Tübingen, Auf der Morgenstelle 8, D-7400 Tübingen 1, Federal Republic of Germany |
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| Abstract: | We present X-ray photoemission spectroscopy (XPS) results obtained on polycrystalline YBa2Cu3O7–x
in the non-metallic (x>0.6) and metallic state (x<0.6) by an in-situ oxygen deloading/loading procedure, thus avoiding uncontrolled surface contaminations. The transition to the metallic (superconducting) state is characterized by corresponding changes in the O1s and Cu2p photoelectron lineshapes being in accordance with charge transfer from CuO2 planes to CuO chains. In particular, a peak at 531.1 eV binding energy is related to the presence of oxygen hole states (O–). |
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