Evidence for single-vortex pinning and unpinning events in superfluid 4He

P. Hakonen; O. Avenel; E. Varoquaux

doi:10.1103/PhysRevLett.81.3451

Evidence for single-vortex pinning and unpinning events in superfluid ⁴He

P. Hakonen^*, O. Avenel, E. Varoquaux

^*Corresponding author for this work

Department of Applied Physics

Research output: Contribution to journal › Article › Scientific › peer-review

14 Citations (Scopus)

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Abstract

We have observed two critical velocity levels for phase slips in superfluid ⁴He at temperatures between 14 and 44 mK, due to microparticles formed in the cell at low temperature. We interpret these observations as evidence for pinning and unpinning events of single vortices of nanometric size. From a study of the lifetime and unpinning velocities of the pinned vortices, we are led to conclude that unpinning takes place by quantum tunneling.

Original language	English
Pages (from-to)	3451-3454
Number of pages	4
Journal	Physical Review Letters
Volume	81
Issue number	16
DOIs	https://doi.org/10.1103/PhysRevLett.81.3451
Publication status	Published - 19 Oct 1998
MoE publication type	A1 Journal article-refereed

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title = "Evidence for single-vortex pinning and unpinning events in superfluid 4He",

abstract = "We have observed two critical velocity levels for phase slips in superfluid 4He at temperatures between 14 and 44 mK, due to microparticles formed in the cell at low temperature. We interpret these observations as evidence for pinning and unpinning events of single vortices of nanometric size. From a study of the lifetime and unpinning velocities of the pinned vortices, we are led to conclude that unpinning takes place by quantum tunneling.",

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