Charge states of atoms in the lattices of the high-temperature superconductors HgBa2Can-1CunO2n+2

Electric field gradient tensor parameters for the copper, barium and mercur y sites of the HgBa2Can-1CunO2n+2 lattices (n = 1, 2, 3) have been determin ed by the emission Mossbauer spectroscopy on the Cu-67(Zn-67), Ba-133(Cs-13 3) and Hg-197(Au-197) isotopes and calculated using the point charge approx imation. An analysis of the obtained results together with published Cu-63 NMR data has shown that an agreement between the experimental and calculate d parameters is possible under assumption that holes arising from lattice d efects are mainly located in oxygen sublattices of the Cu-O planes (Cu(2)-O plane for HgBa2Ca2Cu3O8).