Acoustic-phonon anomaly in MgB2

R. F. Wood, Bo E. Sernelius, and A. L. Chernyshev
Phys. Rev. B 66, 014513 – Published 28 June 2002
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Abstract

Recent first-principles calculations of the phonon dispersion curves in MgB2 have suggested the presence of anomalies in some of the curves, particularly in the longitudinal acoustical (LA) branch in the Γ to A direction. Similar behavior has been observed in numerous other superconductors with Tcs higher than those of standard electron-phonon BCS superconductors. Phenomenological calculations of the ΓA LA dispersion based on both an acoustical plasmon and a “resonant polarization” mechanism are given here to emphasize the importance of these similarities.

  • Received 2 April 2002

DOI:https://doi.org/10.1103/PhysRevB.66.014513

©2002 American Physical Society

Authors & Affiliations

R. F. Wood, Bo E. Sernelius*, and A. L. Chernyshev

  • Solid State Division, Oak Ridge National Laboratory, P.O. Box 2008, Oak Ridge, Tennessee 37831

  • *Permanent address: Department of Physics and Measurement Technology, Linköping University, Sweden.
  • Also at Institute of Semiconductor Physics, Novosibirsk, Russia.

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Vol. 66, Iss. 1 — 1 July 2002

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