Abstract
The electric quadrupole interaction of181Ta in Y2O3, CuO, and in the YBa2Cu3O7−δ high temperature superconductors, doped with181Hf, has been studied by the time-differential perturbed angular correlation method (TDPAC). In Y2O3, two distinct fractions of the probe nuclei were detected, which were attributed to the substitutional positions at the two cation sites in the lattice. In CuO, and in the ceramic samples, broad distributions of quadrupole frequencies were observed. Possible configurations of the probe nuclei in these substances are discussed.
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