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

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.

4 pages, 4 figures, revised version

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