Abstract
The data of Mossbauer emission spectroscopy on 67Cu(67Zn) and 67Ga(67Zn) isotopes show that holes appearing as a result of the Sr2+ substitution for La3+ in the La2 − xSrxCuO4 crystal lattice are localized predominantly at oxygen atoms occurring in the same atomic plane as the copper atoms. In contrast, electrons appearing as a result of the Ce4+ substitution for Nd3+ in the Nd2 − xCexCuO4 crystal lattice are localized in the copper sublattice. These results are consistent with the model assuming that a mechanism responsible for the high-temperature superconductivity in La2 − xSrxCuO4 and Nd2 − xCexCuO4 crystal lattices is based on the interaction of electrons with two-site two-electron centers possessing negative correlation energies (negative-U centers).
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