Low-energy phonons in Bi2Sr2CaCu2O8+δ and their possible interaction with electrons measured by inelastic neutron scattering

A. M. Merritt, J.-P. Castellan, T. Keller, S. R. Park, J. A. Fernandez-Baca, G. D. Gu, and D. Reznik
Phys. Rev. B 100, 144502 – Published 4 October 2019
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Abstract

Electron-phonon interaction in copper oxide superconductors is still enigmatic. Strong coupling for certain optic phonons is now well established experimentally, but a theoretical understanding is challenging. Scattering of electrons near the Fermi surface by the longitudinal acoustic (LA) phonons is expected from basic theory because these phonons modulate electron density. We used inelastic neutron scattering on a large single-crystal sample of optimally doped Bi2Sr2CaCu2O8+δ to show that low-energy LA phonons could couple to electronic density fluctuations only at small phonon wave vectors, which naturally limits any interaction to forward scattering. Such scattering should not be pair-breaking in the case of the d-wave gap. We also found that the previously reported low-energy phonon spectral weight half-way to the zone boundary is consistent with conventional lattice dynamics and does not reflect an incipient charge density wave.

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  • Received 13 December 2017
  • Revised 10 July 2019

DOI:https://doi.org/10.1103/PhysRevB.100.144502

©2019 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

A. M. Merritt1, J.-P. Castellan2, T. Keller3,4, S. R. Park5, J. A. Fernandez-Baca6,7, G. D. Gu8, and D. Reznik1,9,*

  • 1Department of Physics, University of Colorado–Boulder, Boulder, Colorado 80309, USA
  • 2Karlsruhe Institute of Technology, 76021 Karlsruhe, Germany
  • 3Max-Planck-Institut für Festkörperphysik, 70569 Stuttgart, Germany
  • 4Max Planck Society Outstation at the FRM II, 85748 Garching, Germany
  • 5Department of Physics, Incheon National University, Incheon 22012, Republic of Korea
  • 6Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
  • 7Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
  • 8Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, New York 11973, USA
  • 9Center for Experiments on Quantum Materials, University of Colorado–Boulder, Boulder, Colorado 80309, USA

  • *Author to whom all correspondence should be addressed: Dmitry.Reznik@colorado.edu

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Issue

Vol. 100, Iss. 14 — 1 October 2019

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