Evidence for Single-Vortex Pinning and Unpinning Events in Superfluid 4He

Hakonen, Pertti J.; Avenel, O.; Varoquaux, E.

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Evidence for Single-Vortex Pinning and Unpinning Events in Superfluid 4He

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Title:	Evidence for Single-Vortex Pinning and Unpinning Events in Superfluid 4He
Author(s):	Hakonen, Pertti J. ; Avenel, O. ; Varoquaux, E.
Date:	1998
Language:	en
Pages:	3451-3454
Department:	Teknillisen fysiikan laitos Department of Applied Physics
Series:	Physical Review Letters, Volume 81, Issue 16
ISSN:	0031-9007 (printed)
DOI-number:	10.1103/physrevlett.81.3451
Subject:	Physics
Keywords:	helium, flow
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Citation: Hakonen, Pertti J. & Avenel, O. & Varoquaux, E. 1998. Evidence for Single-Vortex Pinning and Unpinning Events in Superfluid 4He. Physical Review Letters. Volume 81, Issue 16. 3451-3454. ISSN 0031-9007 (printed). DOI: 10.1103/physrevlett.81.3451
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.
Rights: © 1998 American Physical Society (APS). This is the accepted version of the following article: Hakonen, Pertti J. & Avenel, O. & Varoquaux, E. 1998. Evidence for Single-Vortex Pinning and Unpinning Events in Superfluid 4He. Physical Review Letters. Volume 81, Issue 16. 3451-3454. ISSN 0031-9007 (printed). DOI: 10.1103/physrevlett.81.3451, which has been published in final form at http://journals.aps.org/prl/abstract/10.1103/PhysRevLett.81.3451.
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