Evidence for Single-Vortex Pinning and Unpinning Events in SuperfluidH4e

Autor:	Eric Varoquaux, O. Avenel, Pertti Hakonen
Rok vydání:	1998
Předmět:	Physics::Fluid Dynamics Superfluidity Physics Condensed matter physics Quantitative Biology::Tissues and Organs Condensed Matter::Superconductivity Phase (matter) Quantum mechanics General Physics and Astronomy Critical ionization velocity Quantum tunnelling Vortex
Zdroj:	Physical Review Letters. 81:3451-3454
ISSN:	1079-7114 0031-9007
DOI:	10.1103/physrevlett.81.3451
Popis:	We have observed two critical velocity levels for phase slips in superfluid ${}^{4}\mathrm{He}$ 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.
Databáze:	OpenAIRE
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