Jpn. J. Appl. Phys. 26 (1987) Supplement 26-3-1 pp. 297-298 |Previous Article| |Next Article| |Table of Contents|
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Proc. 18th Int. Conf. Low Temperature Physics, Kyoto, 1987
Sound Attenuation in Liquid 4He Films at Low Temperatures
1Physics Department, State University of New York at Buffalo, Amherst, N.Y., 14260, USA
2Physics Department, Korea University, Seoul 132, Korea
3Physics Department, Hangyang University, Seoul 133, Korea
The attenuation coefficient of first sound in liquid 4He films is evaluated microscopically for low temperatures where 3p processes are dominant. Near absolute zero, the attenuation coefficient varies as T3 in temperature for low frequencies. However, as the temperature is increased, significant deviations take place due to a quadratic correction term which is due to the anomalous character of the energy dispersion.