CU-61(NI-61) EMISSION MOSSBAUER STUDY OF HYPERFINE INTERACTIONS IN COPPER-BASED OXIDES

摘要

Simple(CuO2, CuO) and complex superconducting (YBa2Cu3O7-x, La2-xSrxCuO4) copper oxides have been investigated by Cu-61(Ni-61) emission Mossbauer spectroscopy. A linear relationship between the quadrupole coupling constant for Ni-61 and the calculated lattice electric held gradients is established, and the contribution of the Ni2+ valence electrons to the coupling constant is determined. Magnetic fields are observed at Ni-61 nuclei in those cases when the copper sublattice shows magnetic ordering. [References: 16]