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Phase-slips in the flow of superfluid 4He through a submicron orifice

โœ Scribed by Ajay Amar; J.C. Davis; R.E. Packard; R.L. Lozes

Publisher
Elsevier Science
Year
1990
Tongue
English
Weight
238 KB
Volume
165-166
Category
Article
ISSN
0921-4526

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โœฆ Synopsis

We have constructed a 6 Hz Helmholtz oscillator to study phase-slip phenomena in superfluid 4He.This method was pioneered by Zimmermann (l-2) and by . A superconducting displacement transducer employing a D.C. SQUID and capable of resolving a displacement of 2 x lo-13 m in one second is used. We report preliminary flow studies at 0.3K using a slit with cross-sectional dimensions of 0.4~ x4.61 and 0.08~ length. We detect sudden dissipation events, the smallest being consistent with phaseslips of 2~

๐Ÿ“œ SIMILAR VOLUMES

Critical flow of superfluid helium-4 thr
Critical flow of superfluid helium-4 through a submicron aperture: Dependence on pressure
โœ O. Avenel; E. Varoquaux; W. Zimmermann Jr. ๐Ÿ“‚ Article ๐Ÿ“… 1990 ๐Ÿ› Elsevier Science ๐ŸŒ English โš– 215 KB

We report the existence of a pressure dependence of the critical velocity of flow of superfluid 4He through a submicron aperture. Combined with the already-known temperature dependence of the critical velocity at very low temperatures, this observation puts further experimental constraints on the me

Critical flow of superfluid helium-4 thr
Critical flow of superfluid helium-4 through a submicron aperture: width of the critical transition
โœ W. Zimmermann Jr; O. Avenel; E. Varoquaux ๐Ÿ“‚ Article ๐Ÿ“… 1990 ๐Ÿ› Elsevier Science ๐ŸŒ English โš– 221 KB

We have observed the critical onset of dissipation in the flow of superfluid 4He through a submicron aperture as a function of velocity to have a finite width that increases with temperature. The results suggest a thermal activation barrier of the form &(l-v/vc,,) with Eo of the order of 1.5x10-21 J