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Anisotropic second sound in superfluid4He nearTλin the presence of a heat current

✍ Scribed by R. Haussmann

Publisher
Springer US
Year
1992
Tongue
English
Weight
462 KB
Volume
88
Category
Article
ISSN
0022-2291

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✦ Synopsis

In the presence of a homogeneous heat current the isotropy of supetfluid 4He 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.

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