Thermodynamics of Superfluidity

Details Thermodynamics of Superfluidity Thermodynamics of Superfluidity

2004-05-06

arxiv.org/abs/cond-mat/0405111v1

Journal of Low Temperature Physics 135 (5-6): 411-421, June 2004

Physics

Condensed Matter

Soft Condensed Matter

Polished and enlarged version of cond-mat/0304019. To appear in JLTP (Olli V. Lounasmaa Memorial Issue). 10 pages, 2 figures

Scientific paper

10.1023/B:JOLT.0000029505.92429.

New, superfluid specific additive integral of motion is found. This facilitates investigation of general thermodynamic equilibrium conditions for superfluid. The analysis is performed in an extended space of thermodynamic variables containing (along with the usual thermodynamic coordinates such as pressure and temperature) superfluid velocity and momentum density. The equilibrium stability conditions lead to thermodynamic inequalities which replace the Landau superfluidity criterion at finite temperatures.

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