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Anisotropic second sound in superfluid He near T in the presence of a heat current

Journal of Low Temperature Physics, ISSN: 0022-2291, Vol: 88, Issue: 3-4, Page: 249-259
1992
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  • Citations
    8
    • Citation Indexes
      8

Article Description

In the presence of a homogeneous heat current the isotropy of superfluid He is broken and the propagation of second-sound waves becomes anisotropic. We calculate the angular dependence of the velocity and damping of second sound near T within model F of Halperin, Hohenberg and Siggia to leading order in the renormalized couplings. The critical behavior is incorporated using results of the renormalization-group theory. Second-sound waves propagating parallel to the heat current become unstable if the heat current exceeds some critical value. The theory agrees with recent experiments. © 1992 Plenum Publishing Corporation.

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