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Abstract:
O-17 NMR is used to probe the local influence of nonmagnetic Zn and
magnetic Ni impurities in the superconducting state of optimally doped
high T-C YBa2Cu3O7. Zn and Ni induce a staggered paramagnetic
polarization, similar to that evidenced above T-C, with a typical
extension xi=3 cell units for Zn and xi >= 3 for Ni. In addition, Zn is
observed to induce a local density of states near the Fermi energy in
its neighborhood, which also decays over about 3 cell units. Its
magnitude decreases sharply with increasing temperature. This allows
direct comparison with the STM observations done in BiSCCO.
