Slave Boson Approach to Neutron Scattering in YBa2Cu3O6+y Superconductors

Jan Brinckmann and Patrick A. Lee
Phys. Rev. Lett. 82, 2915 – Published 5 April 1999
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Abstract

The evolution of the so-called “41 meV resonance” in the magnetic response of YBCO cuprates is studied with slave boson theory for the ttJ model. The resonance appears as a collective spin fluctuation in the d-wave superconducting (SC) state. It is undamped at optimal doping due to a threshold in the excitation energies of particle-hole pairs with relative wave vector (π,π). When hole filling is reduced, the resonance moves to lower energies and broadens. Below the resonance energy we find a crossover to an incommensurate response in agreement with a recent experiment on YBa2Cu3O6.6. We show that dynamic nesting in the d-wave SC state causes this effect.

  • Received 3 November 1998

DOI:https://doi.org/10.1103/PhysRevLett.82.2915

©1999 American Physical Society

Authors & Affiliations

Jan Brinckmann* and Patrick A. Lee

  • Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139

  • *Present address: Universität Karlsruhe, TKM/Physik, Postfach 6980, D-76128 Karlsruhe, Germany.

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Issue

Vol. 82, Iss. 14 — 5 April 1999

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