Glass-specific behavior in the damping of acoustic-like vibrations
Abstract
High frequency sound is observed in lithium diborate glass, Li2O--2B2O3, 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 all sufficiently strong glasses. We conjecture that this behavior, specific to glassy materials, must be quite universal among them.
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