Depinning of a superfluid vortex line by Kelvin waves

We measure the interaction of a single superfluid vortex with surface irregularities. While vortex pinning in superconductors usually becomes weaker at higher temperatures, we find the opposite behavior. The pinning steadily increases throughout our measurement range, from 0.15Tc to over 0.5Tc. We a...

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Bibliographic Details
Published in:arXiv.org 2001-10
Main Authors: Donev, L A K, Hough, L, Zieve, R J
Format: Article
Language:English
Subjects:
Fluids
Kelvin waves
Pinning
Rangefinding
Superfluidity
Vortices
Online Access:Get full text
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Summary:We measure the interaction of a single superfluid vortex with surface irregularities. While vortex pinning in superconductors usually becomes weaker at higher temperatures, we find the opposite behavior. The pinning steadily increases throughout our measurement range, from 0.15Tc to over 0.5Tc. We also find that moving the other end of the vortex decreases the pinning, so we propose Kelvin waves along the vortex as a depinning mechanism.
ISSN:2331-8422
DOI:10.48550/arxiv.0010240