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Glass-specific behavior in the damping of acoustic-like vibrations

B. Rufflé·G. Guimbretière·E. Courtens·R. Vacher·G. Monaco
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Abstract

High frequency sound is observed in lithium diborate glass, Li$_2$O--2B$_2$O$_3$, using Brillouin scattering of light and x-rays. The sound attenuation exhibits a non-trivial dependence on the wavevector, with a remarkably rapid increase towards a Ioffe-Regel crossover as the frequency approaches the boson peak from below. An analysis of literature results reveals the near coincidence of the boson-peak frequency with a Ioffe-Regel limit for sound in {\em all} sufficiently strong glasses. We conjecture that this behavior, specific to glassy materials, must be quite universal among them.

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B. Rufflé, G. Guimbretière, E. Courtens, R. Vacher, G. Monaco. 2005-09-01. Glass-specific behavior in the damping of acoustic-like vibrations. https://doi.org/10.1103/physrevlett.96.045502

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