Chang, Y.Ming, TangOnellion, M.Hampshire, D.Larbalestier, D. C.Margaritondo, G.Stoffel, N. G.Tarascon, J. M.2006-10-032006-10-032006-10-03198810.1063/1.37107https://infoscience.epfl.ch/handle/20.500.14299/234438The oxygen content determines the transport properties of Ba₂YCu₃O_7+x and EuBa₂Cu₃O_7+x, and in particular their superconducting behavior at high temperatures. The authors studied the changes in the Ba₂YCu₃O_7+x electronic structure which are caused by modifications in the amount of oxygen. The modifications were achieved either by thermal annealing or by exposure to `white' synchrotron radiation which causes oxygen desorption, with similar results. They found that the decrease in oxygen content affects the line-shape of the upper valence band features and the relative intensity of the Cu satellite features. The lineshape changes simplify the identification of oxygen-related features in the upper valence band region. The exposure to `white' synchrotron radiation of Ba₂EuCu₃O_7+x did not produce similarly large spectral changesband structure of crystalline semiconductors and insulatorsbarium compoundseuropium compoundsspectral line breadthtype II superconductorsvalence bandsyttrium compoundshigh temperature superconductivityO stoichiometry dependenceelectronic structuretransport propertiessuperconducting behaviorthermal annealingsynchrotron radiationline-shapeupper valence band featuresrelative intensityCu satellite featuresBa₂YCu₃O_7+xEuBa₂Cu₃O_7+xtext::conference output::conference proceedings::conference paper