The two-fluid model with superfluid entropy |
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Authors: | R Schäfer T Fliessbach |
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Institution: | (1) Fachbereich Physik, University of Siegen, D-57068 Siegen, Germany |
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Abstract: | Summary The two-fluid model of liquid helium is generalized to the case that the superfluid fraction has a small entropy content.
We present theoretical arguments in favour of such a small superfluid entropy. In the generalized two-fluid model various
sound modes of He II are investigated. In a superleak carrying a persistent current the superfluid entropy leads to a new
sound mode which we call sixth sound. The relation between the sixth sound and the superfluid entropy is discussed in detail. |
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Keywords: | Boson degeneracy and superfluidity of helium-4 |
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