Impurity induced Local Magnetism and Density of States in the superconducting state of YBa2Cu3O7

Details Impurity induced Local Magnetism and Density of States in the superconducting state of YBa2Cu3O7 Impurity induced Local Magnetism and Density of States in the superconducting state of YBa2Cu3O7

2005-04-27

arxiv.org/abs/cond-mat/0504727v2

Phys.Rev.Lett. 96, 127005 (2006)

Physics

Condensed Matter

Superconductivity

4 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.96.127005

Oxygen NMR is used to probe the local influence of nonmagnetic Zn and magnetic Ni impurities in the superconducting state of optimally doped high Tc YBa2Cu3O7. Zn and Ni induce a staggered paramagnetic polarization, similar to that evidenced above Tc, 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 neighbourhood, 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 BiSCO.

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