SURFACE ELECTRONIC STRUCTURE AND CHEMICAL BOUNDING OF REBa₂Cu₃O_y (RE = Y, Pr, Gd, Eu, Er and Sm)Cu3Oy (RE = Y, Pr, Gd, Eu, Er and Sm)

Resumo

X-ray photoelectron spectra of high temperature superconductors and related compounds REBa₂Cu₃O_y were investigated. It was studied the influence of different rare earth elements on the valence band structure and inner shell levels. Valence band, which are associated to the hybridization of Cu3d and O2p states, were studied to examine the Cu-O derived states observed in this region. It is also presented a study on the sub-bands overlap and 4f–2p hybridization for the different prepared compounds