Abstract
The method of emission Mossbauer spectroscopy on the 67Cu(67Zn) isotope is used for determining the parameters of nuclear quadrupole interaction at copper sites of the Y2Ba4Cu7O15 lattice. The tensor of crystal electric field gradient at all the sites of the lattice is calculated using the model of point charges. A comparison of experimental and calculated parameters leads to the conclusion that holes in the Y2Ba4Cu7O15 lattice are localized predominantly at positions of chain oxygen.
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