Abstract
The method of Mössbauer spectroscopy on isotopes 61Cu (61Ni) shows that for bivalent copper dielectric metal oxides, a combined quadrupole and Zeeman interaction of 61Ni nuclei with local fields in copper sites is observed, whereas for superconducting metal oxides, only quadrupole interaction of the nuclei 61Ni is detected. For all the metal oxides under consideration, the equal in value valence contribution to the electric field gradient tensor was found.
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