Abstract
The x-ray edges of Pr, Pb and Cu in the mixed (Hg, Pr)- and (Hg, Pb)-1212 and 1201 superconductors were studied in order to obtain information about the electronic structure of the (Hg, Pr) - and (Hg, Pb) - O planes and their dependence on O stoichiometry. It has been found that, in Pr doped samples, the average valence of Pr increases with increasing O content. Concomitantly, the density of doping holes increases in the Cu - O planes. In the case of Pb doped samples, the Pb valence was found to be unchanged. We have estimated the density of doping holes per Cu - O plane for these doped Hg superconductors. The results are discussed in view of the band structure calculations in this system.
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