Observation of single-vortex pinning in superfluid 4He

Research output: Contribution to journalArticle

Researchers

Research units

  • Université Paris-Sud
  • CEA

Abstract

Flow-induced pinning and unpinning of vortices have been investigated experimentally in superfluid 4He at temperatures varying from 14 to 44 mK. The lifetime and unpinning velocities of pinned vortices could be measured by following the apparent changes of the critical velocity for phase slips. The pinned vortex size and location can be deduced from the magnitude of these changes and are found, in these experiments, to be of nanometer size. The experimental observations indicate that unpinning takes place by quantum tunnelling and provide information on the phenomenon of superflow collapse in pinholes.

Details

Original languageEnglish
Pages (from-to)55-74
Number of pages20
JournalPhysica B: Condensed Matter
Volume255
Issue number1-4
Publication statusPublished - 1 Dec 1998
MoE publication typeA1 Journal article-refereed

    Research areas

  • Collapse, Pinning, Superfluid, Tunnelling, Vortex

ID: 4395207