Collective excitations in metallic glasses: A model of dynamic structure

Laurent J. Lewis and N. W. Ashcroft
Phys. Rev. B 34, 8477 – Published 15 December 1986
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Abstract

Glasses lack the diffusive nature of dense liquids and the long-range order of crystals, two essential features which, by an elementary argument on the form of the density of collective modes, may be incorporated into a simple model for the displacement-displacement correlation function of a glassy metal. This, in turn, is used to evaluate the dynamic structure factor, and from an application of the theory to a typical system, a dispersion relation for collective excitations is obtained which is found to exhibit a rotonlike minimum.

  • Received 25 June 1986

DOI:https://doi.org/10.1103/PhysRevB.34.8477

©1986 American Physical Society

Authors & Affiliations

Laurent J. Lewis and N. W. Ashcroft

  • Laboratory of Atomic and Solid State Physics, and Materials Science Center, Cornell University, Ithaca, New York 14853-2501

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Issue

Vol. 34, Iss. 12 — 15 December 1986

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