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

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

2005-06-13

arxiv.org/abs/cond-mat/0506287v2

Phys. Rev. Lett. 96, 045502 (2006)

Physics

Condensed Matter

Disordered Systems and Neural Networks

4 pages, 4 figures, revised version

Scientific paper

10.1103/PhysRevLett.96.045502

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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