Anharmonic vs. relaxational sound damping in glasses: I. Brillouin scattering from densified silica

Details Anharmonic vs. relaxational sound damping in glasses: I. Brillouin scattering from densified silica Anharmonic vs. relaxational sound damping in glasses: I. Brillouin scattering from densified silica

2005-05-23

arxiv.org/abs/cond-mat/0505558v3

Physics

Condensed Matter

Disordered Systems and Neural Networks

9 pages with 7 figures, added references

Scientific paper

10.1103/PhysRevB.72.214204

This series discusses the origin of sound damping and dispersion in glasses. In particular, we address the relative importance of anharmonicity versus thermally activated relaxation. In this first article, Brillouin-scattering measurements of permanently densified silica glass are presented. It is found that in this case the results are compatible with a model in which damping and dispersion are only produced by the anharmonic coupling of the sound waves with thermally excited modes. The thermal relaxation time and the unrelaxed velocity are estimated.

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