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    XPS studies of Cu1-xTlxBa2Ca 2Cu3O10-y superconductor thin films

    , Article Physica C: Superconductivity and its Applications ; Volume 433, Issue 1-2 , 2005 , Pages 21-27 ; 09214534 (ISSN) Khan, N. A ; Khurram, A. A ; Sabeeh, K ; Iraji Zad, A ; Ahadian, M. M ; Sharif University of Technology
    X-ray photoemission spectroscopy (XPS) of Cu1-xTl xBa2Ca2Cu3O10-δ (Cu1-xTlx-1223) superconductors thin films is studied. These films were prepared by amorphous phase epitaxy method on the SrTiO 3 substrate. This compound has Cu1-xTlxBa 2O4-δ charge reservoir layer and three CuO 2 planes. The atoms in the CuO2 planes have strong covalent bonding, while the some of the atoms in Cu1-xTl xBa2O4-δ charge reservoir, such as oxygen (Oδ) have predominantly secondary bonding and could be removed from the unit cell. The deliberate or inadvertent removal of the oxygen from the unit cell may change the charge state of the constituent atoms in the charge reservoir layer. The charge state of the atoms in...