Theory of sound attenuation in glasses: The role of thermal vibrations

Details Theory of sound attenuation in glasses: The role of thermal vibrations Theory of sound attenuation in glasses: The role of thermal vibrations

1999-01-08

arxiv.org/abs/cond-mat/9901069v1

Physics

Condensed Matter

8 pages, 3 figures; to appear in PRL

Scientific paper

10.1103/PhysRevLett.82.1478

Sound attenuation and internal friction coefficients are calculated for a realistic model of amorphous silicon. It is found that, contrary to previous views, thermal vibrations can induce sound attenuation at ultrasonic and hypersonic frequencies that is of the same order or even larger than in crystals. The reason is the internal-strain induced anomalously large Gr\"uneisen parameters of the low-frequency resonant modes.

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