EVIDENCE FOR SINGLE-VORTEX PINNING AND UNPINNING EVENTS IN SUPERFLUIDHE-4

Authors
HAKONEN P AVENEL O VAROQUAUX E
Citation
P. Hakonen et al., EVIDENCE FOR SINGLE-VORTEX PINNING AND UNPINNING EVENTS IN SUPERFLUIDHE-4, Physical review letters, 81(16), 1998, pp. 3451-3454
Citations number
18
Categorie Soggetti
Physics
Journal title
Physical review letters → ACNP
ISSN journal
00319007
Volume
81
Issue
16
Year of publication
1998
Pages
3451 - 3454
Database
ISI
SICI code
0031-9007(1998)81:16<3451:EFSPAU>2.0.ZU;2-Y
Abstract
We have observed two critical velocity levels for phase slips in super fluid He-4 at temperatures between 14 and 44 mK, due to microparticles formed in the cell at low temperature. We interpret these observation s as evidence for pinning and unpinning events of single vortices of n anometric size. From a study of the lifetime and unpinning velocities of the pinned vortices, we are led to conclude that unpinning takes pl ace by quantum tunneling. [S0031-9007(98)07420-1].