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Evidence for single-vortex pinning and unpinning events in superfluid 4He
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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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en
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4
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Physical Review Letters, Volume 81, issue 16, pp. 3451-3454
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.
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Hakonen, P, Avenel, O & Varoquaux, E 1998, 'Evidence for single-vortex pinning and unpinning events in superfluid 4 He', Physical Review Letters, vol. 81, no. 16, pp. 3451-3454. https://doi.org/10.1103/PhysRevLett.81.3451