Effect of Nonmagnetic Impurities on the Magnetic Resonance Peak in YBa2Cu3O7

Details Effect of Nonmagnetic Impurities on the Magnetic Resonance Peak in YBa2Cu3O7 Effect of Nonmagnetic Impurities on the Magnetic Resonance Peak in YBa2Cu3O7

1998-12-02

arxiv.org/abs/cond-mat/9812047v1

Phys. Rev. Lett. 82, 1939 (1999)

Physics

Condensed Matter

Superconductivity

Scientific paper

10.1103/PhysRevLett.82.1939

The magnetic excitation spectrum of a YBa_2 Cu_3 O_7 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 ~ 40 meV is observed exclusively below the superconducting transition temperature T_c, the magnetic response in the Zn-substituted system is broadened significantly and vanishes at a temperature much higher than T_c. The energy-integrated spectral weight observed near q = (pi,pi) increases with Zn substitution, and only about half of the spectral weight is removed at T_c.

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