Fluctuative mechanism of vortex nucleation in the flow of 4He

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Abstract

We propose a mechanism of a vortex nucleation in a flow of a superfluid 4He. The mechanism is related to the creation by critical fluctuations of a “plasma” of half-vortex rings located near the wall. The “plasma” screens the attraction of the vortex to the wall and permits vortex nucleation. In the spirit of Williams-Shenoy theory we derive the scaling laws in the critical region and estimate the scaling relation and the critical exponent p for critical velocity; we find Vc∼V0(1-T/Tc), so that p=1. Various applications of the obtained results are discussed.

Original languageBritish English
Pages (from-to)1880-1883
Number of pages4
JournalPhysical Review Letters
Volume76
Issue number11
DOIs
StatePublished - 11 Mar 1996

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