Observation of the onset of strong scattering on high frequency acoustic phonons in densified silica glass

Details Observation of the onset of strong scattering on high frequency acoustic phonons in densified silica glass Observation of the onset of strong scattering on high frequency acoustic phonons in densified silica glass

2003-01-24

arxiv.org/abs/cond-mat/0301490v1

Phys. Rev. Lett. 90, 095502 (2003)

Physics

Condensed Matter

Disordered Systems and Neural Networks

4 pages, 4 figures, to appear in Phys. Rev. Letters

Scientific paper

10.1103/PhysRevLett.90.095502

The linewidth of longitudinal acoustic waves in densified silica glass is obtained by inelastic x-ray scattering. It increases with a high power alpha of the frequency up to a crossover where the waves experience strong scattering. We find that \alpha is at least 4, and probably larger. Resonance and hybridization of acoustic waves with the boson-peak modes seems to be a more likely explanation for these findings than Rayleigh scattering from disorder.

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