Abstract
The parameters of the electric-field gradient tensor at copper and barium sites in the Tl2Ba2Can−1CunO2n+4 (n=1,2,3) lattice have been determined by 61Cu(61Ni) and 133Ba(133Cs) Mossbauer emission spectroscopy, and calculated in the point-charge approximation. The calculated parameters can be reconciled with experiment if one assumes that the holes produced as the valence state of a part of thallium atoms is lowered are localized predominantly on the oxygen sublattice lying in the same plane with copper atoms [in the Cu(2) plane in the Tl2Ba2Ca2Cu3O10 lattice]. 133Ba(133Cs) Mossbauer emission spectroscopy data agree qualitatively with the proposed models of charge distribution in the Tl2Ba2Can−1CunO2n+4 lattices.
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