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Third sound and the onset of superfluidity in unsaturated helium films

Goodstein, David (1969) Third sound and the onset of superfluidity in unsaturated helium films. Physical Review, 183 (1). pp. 327-334. ISSN 0031-899X. doi:10.1103/PhysRev.183.327.

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A simple model, commonly used for describing the behavior of the superfluid film is examined, and it is found to become spontaneously unstable when the partial molar entropy falls below a certain finite value for each temperature and film thickness. The instability is proposed as the cause of the onset curve for superfluidity in unsaturated films, and comparisons with experiment are made. In addition, the use of thermodynamic identities in the model leads to a new and more accurate expression for the velocity of third sound in terms of other measurable quantities.

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Additional Information:©1969 The American Physical Society. Received 12 March 1969. The author is especially grateful for enthusiastic help from Professor P.G. Saffman and Professor R.P. Feynman. In addition, there have been fruitful discussions with Professors I. Rudnick, D. Bergmann, and R. Elgin.
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Record Number:CaltechAUTHORS:GOOpr69
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:6027
Deposited By: Tony Diaz
Deposited On:15 Nov 2006
Last Modified:08 Nov 2021 20:30

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