Impurity-Induced Local Magnetism and Density of States in the Superconducting State of YBa2Cu3O7

S. Ouazi; J. Bobroff; H. Alloul; M. Le Tacon; N. Blanchard; G. Collin; M. H. Julien; M. Horvatić; C. Berthier

doi:10.1103/PhysRevLett.96.127005

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Impurity-Induced Local Magnetism and Density of States in the Superconducting State of YBa2Cu3O7

S. Ouazi, J. Bobroff, H. Alloul, M. Le Tacon, N. Blanchard, G. Collin, M. H. Julien, M. Horvatić, C. Berthier

DOI 10.1103/PhysRevLett.96.127005 · Physical Review Letters

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Abstract

O17 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 ξ=3 cell units for Zn and ξ≥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.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
YBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown