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We have examined the magnetic properties of polycrystalline, superconductingYBa_2(Cu_0.96Ni_0.04)_3O_y (y ~ 7, T_sc ~ 75 K) using two local probetechniques: 170Yb Moessbauer down to 0.1 K and muon spin relaxation (muSR) downto 1.5 K. At 0.1 K, the 170Yb measurements show the Cu(2) over essentially allthe sample volume carry magnetically correlated moments which are static on thetime-scale of 10^{-9} s. The moments show a distribution in size. Thecorrelations are probably short range. As the temperature increases, thecorrelated moments are observed to fluctuate with measurable rates (in the GHzrange) which increase as the temperature increases and which show a widedistribution. The muSR measurements also evidence that the fluctuation ratesincrease with increasing temperature and there is a distribution. The evidencedfluctuating, correlated Cu(2) moments coexist at an atomic level withsuperconductivity.

Dynamic correlated Cu(2) magnetic moments in superconducting YBa_2(Cu_0.96Ni_0.04)_3O_y (y ~ 7)