Neutron scattering and the B1g phonon in the cuprates

T. P. Devereaux, A. Virosztek, and A. Zawadowski
Phys. Rev. B 59, 14618 – Published 1 June 1999
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Abstract

The momentum-dependent line shape of the out-of-phase oxygen vibration as measured in recent neutron-scattering measurements is investigated. Starting from a microscopic coupling of the phonon vibration to a local crystal field, the phonon line shift and broadening is calculated as a function of transferred momentum in the superconducting state of YBa2Cu3O7. The absolute magnitude of the shift is obtained as a function of momentum and is found to be in excellent agreement with experiment. It is shown that the anisotropy of the density of states, superconducting energy gap, and the electron-phonon coupling are all crucial in order to explain these experiments.

  • Received 13 March 1998

DOI:https://doi.org/10.1103/PhysRevB.59.14618

©1999 American Physical Society

Authors & Affiliations

T. P. Devereaux

  • Department of Physics, George Washington University, Washington, D.C. 20052

A. Virosztek and A. Zawadowski

  • Institute of Physics and Research Group of the Hungarian Academy of Sciences, Technical University of Budapest, H-1521 Budapest, Hungary
  • Research Institute for Solid State Physics, P.O. Box 49, H-1525 Budapest, Hungary

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Vol. 59, Iss. 22 — 1 June 1999

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