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VOLUME 75 | ISSUE 8 | PAGE 491
On Kelvin--Helmholtz instability in superfluids
G. E. Volovik
Low Temperature Laboratory, Helsinki University of Technology, FIN-02015 HUT, Finland
L. D. Landau Institute for Theoretical Physics RAS, 117940 Moscow, Russia

PACS: 47.20.Ma, 67.57.Np, 68.05.-n
The Kelvin-Helmholtz instability in superfluids is discussed, based on the first experimental observation of such instability at the interface between superfluid 3He-A and superfluid 3He-B (R. Blaauwgeers, V. B. Eltsov, G. Eska et al., cond-mat/0111343). We discuss why the Kelvin-Helmholtz criterion, the Landau critical velocity for nucleation of ripplons, and the free energy consideration all give different values for the instability treshold.

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