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APS » Journals » Phys. Rev. Lett. » Volume 84 » Issue 25
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Phys. Rev. Lett. 84, 5900–5903 (2000)

Quantum Impurities and the Neutron Resonance Peak in YBa2Cu3O7: Ni versus Zn

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Y. Sidis1, P. Bourges1, H. F. Fong2, B. Keimer2,3, L. P. Regnault4, J. Bossy5, A. Ivanov6, B. Hennion1, P. Gautier-Picard1, G. Collin1, D. L. Millius7, and I. A. Aksay7
1Laboratoire Léon Brillouin, CEA-CNRS, CE-Saclay, 91191 Gif sur Yvette, France
2Department of Physics, Princeton University, Princeton, New Jersey 08544
3Max-Planck-Institut für Festkörperforschung, 70569 Stuttgart, Germany
4CEA Grenoble, Département de Recherche Fondamentale sur la Matière Condensée, 38054 Grenoble cedex 9, France
5CNRS-CRTBT, BP 156, 38042 Grenoble cedex 9, France
6Institut Laue Langevin, 156X, 38042 Grenoble cedex 9, France
7Department of Chemical Engineering, Princeton University, Princeton, New Jersey 08544

Received 13 December 1999; published in the issue dated 19 June 2000

The influence of magnetic ( S = 1) and nonmagnetic ( S = 0) impurities on the spin dynamics of an optimally doped high temperature superconductor is compared in YBa2(Cu0.97Ni0.03)3O7 ( Tc = 80K) and YBa2(Cu0.99Zn0.01)3O7 ( Tc = 78K). In the Ni-substituted system, the magnetic resonance peak (which is observed at Er≃40meV in the pure system) shifts to lower energy with a preserved Er/Tc ratio while the shift is much smaller upon Zn substitution. By contrast Zn, but not Ni, restores significant spin fluctuations around 40 meV in the normal state. These observations are discussed in the light of models proposed for the magnetic resonance peak.

© 2000 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.84.5900
DOI:
10.1103/PhysRevLett.84.5900
PACS:
78.70.Nx, 74.70.-b, 75.40.Gb
 
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