99Ru (←99Rh) as a TDPAC Probe in the Study of a High-Tc Superconductor

A radiochemical procedure has been established to dope carrier-free 99Rh in YBa2Cu3O7−x. The time-differential perturbed-angular correlation of γ-rays emitted from the nuclear excited levels of the daughter nuclide 99Ru in the superconducting and semiconducting samples with x99Ru is a useful hyperfine-interaction probe comparable to 57Fe.0.2 and 1.0, respectively, revealed the hyperfine electric quadrupole interaction for the former and the magnetic interaction in addition for the latter. The results have shown that