Evidence for Single-Vortex Pinning and Unpinning Events in Superfluid 4He
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Journal Title
Journal ISSN
Volume Title
School of Science |
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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Date
1998
Major/Subject
Mcode
Degree programme
Language
en
Pages
3451-3454
Series
Physical Review Letters, Volume 81, Issue 16
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.Description
Keywords
helium, flow
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
