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Journal Article

Impurity-induced local magnetism and density of states in the superconducting state of YBa2Cu3O7

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Le Tacon,  M.
Solid State Spectroscopy, Max Planck Institute for Solid State Research, Max Planck Society;

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Horvatić,  M.
High Magnetic Field Laboratory, Former Departments, Max Planck Institute for Solid State Research, Max Planck Society;

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Berthier,  C.
High Magnetic Field Laboratory, Former Departments, Max Planck Institute for Solid State Research, Max Planck Society;

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Citation

Ouazi, S., Bobroff, J., Alloul, H., Le Tacon, M., Blanchard, N., Collin, G., et al. (2006). Impurity-induced local magnetism and density of states in the superconducting state of YBa2Cu3O7. Physical Review Letters, 96(12): 127005.


Cite as: https://hdl.handle.net/21.11116/0000-000E-B495-E
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.