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Phys. Rev. Lett. 82, 1939–1942 (1999)

Effect of Nonmagnetic Impurities on the Magnetic Resonance Peak in YBa2Cu3O7

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H. F. Fong1, P. Bourges2, Y. Sidis2, L. P. Regnault3, J. Bossy4, A. Ivanov5, D. L. Milius6, I. A. Aksay6, and B. Keimer1,7
1Department of Physics, Princeton University, Princeton, New Jersey 08544
2Laboratoire Léon Brillouin, CEA-CNRS, CE Saclay, 91191 Gif-sur-Yvette, France
3CEA Grenoble, Département de Recherche Fondamentale sur la matière Condensée, 38054 Grenoble cedex 9, France
4CNRS-CRTBT, BP 156, 38042 Grenoble Cedex 9, France
5Institut Laue-Langevin, 156X, 38042 Grenoble Cedex 9, France
6Department of Chemical Engineering, Princeton University, Princeton, New Jersey 08544
7Max-Planck-Institut für Festkörperforschung, D-70569 Stuttgart, Germany

Received 27 August 1998; published in the issue dated 1 March 1999

The magnetic excitation spectrum of a YBa2Cu3O7 crystal containing 0.5% of nonmagnetic (Zn) impurities has been determined by inelastic neutron scattering. Whereas in the pure system a sharp resonance peak at E≃40meV is observed exclusively below the superconducting transition temperature Tc, the magnetic response in the Zn-substituted system is broadened significantly and vanishes at a temperature much higher than Tc. The energy-integrated spectral weight observed near q = (π,π) increases with Zn substitution, and only about half of the spectral weight is removed at Tc.

© 1999 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.82.1939
DOI:
10.1103/PhysRevLett.82.1939
PACS:
74.62.Dh, 74.20.Mn, 74.72.Bk, 75.40.Gb
 
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