Abstract
A linear correlation between the quadrupole coupling constants C (Cu) measured by the 63Cu NQR/NMR technique on the one hand and C (Zn) measured by the 67Cu/67Zn emission Mössbauer spectroscopy on the other hand has been found. The deviation from the linear dependence for a particular substance indicates a considerable difference of the copper charge state from 2+ or different orientations of the z-axes for the total and lattice electric field gradient (EFG) tensors on 63Cu. A similar deviation from the linear dependence of C (Cu) on the principal component of the lattice EFG tensor calculated for the copper sites permits to find a difference of the accepted model from the actual charge distribution in the HTSC lattice sites.
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