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APS » Journals » Phys. Rev. Lett. » Volume 82 » Issue 7
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Phys. Rev. Lett. 82, 1478–1481 (1999)

Theory of Sound Attenuation in Glasses: The Role of Thermal Vibrations

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Jaroslav Fabian1,2 and Philip B. Allen2
1Department of Physics, University of Maryland at College Park, College Park, Maryland 20742-4111
2Department of Physics and Astronomy, State University of New York at Stony Brook, Stony Brook, New York 11794-3800

Received 13 October 1998; published in the issue dated 15 February 1999

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 Grüneisen parameters of the low-frequency resonant modes.

© 1999 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.82.1478
DOI:
10.1103/PhysRevLett.82.1478
PACS:
62.65.+k, 62.80.+f, 63.50.+x
 
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