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arXiv · cond-mat/9507038

The two-fluid model with superfluid entropy

R. Schaefer·T. Fliessbach
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Abstract

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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R. Schaefer, T. Fliessbach. 1995-07-13. The two-fluid model with superfluid entropy. https://doi.org/10.1007/bf02451645

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