The two-fluid model with superfluid entropy

Details The two-fluid model with superfluid entropy The two-fluid model with superfluid entropy

1995-07-12

arxiv.org/abs/cond-mat/9507038v2

Physics

Condensed Matter

22 pages, latex, published in Nuovo Cimento 16 D (1994) 373

Scientific paper

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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