Abstract
Flow measurements in ultra-pure {sup 4}He through a micron-size orifice at millikelvin temperatures show the transition from thermal to quantum nucleation of nanometer-size vortices below a crossover temperature of 0.147 K. Detailed analysis, similar to that done for macroscopic quantum tunnelling in superconducting junctions, yields parameters which accurately predict the mean value and the distribution width of the critical velocities at all temperatures. These observations establish the close relationship between this type of critical flow and negative ion motion in superfluid {sup 4}He and strongly suggest that the underlying mechanism is identical.
Avenel, O;
[1]
Ihas, G G;
[2]
Aarts, R;
[2]
Varoquaux, E
[3]
- CEA Centre d`Etudes de Saclay, 91 - Gif-sur-Yvette (France). Dept. de Recherche sur l`Etat Condense, les Atomes et les Molecules
- CEA Centre d`Etudes de Saclay, 91 -Gif-sur-Yvette (France). Dept. de Recherche sur l`Etat Condense, les Atomes et les Molecules
- Paris-11 Univ., 91 - Orsay (France). Lab. de Physique des Solides
Citation Formats
Avenel, O, Ihas, G G, Aarts, R, and Varoquaux, E.
Dissipative flow of superfluid {sup 4}He through a small orifice by quantum and thermal nucleation of vortices.
France: N. p.,
1992.
Web.
Avenel, O, Ihas, G G, Aarts, R, & Varoquaux, E.
Dissipative flow of superfluid {sup 4}He through a small orifice by quantum and thermal nucleation of vortices.
France.
Avenel, O, Ihas, G G, Aarts, R, and Varoquaux, E.
1992.
"Dissipative flow of superfluid {sup 4}He through a small orifice by quantum and thermal nucleation of vortices."
France.
@misc{etde_10129660,
title = {Dissipative flow of superfluid {sup 4}He through a small orifice by quantum and thermal nucleation of vortices}
author = {Avenel, O, Ihas, G G, Aarts, R, and Varoquaux, E}
abstractNote = {Flow measurements in ultra-pure {sup 4}He through a micron-size orifice at millikelvin temperatures show the transition from thermal to quantum nucleation of nanometer-size vortices below a crossover temperature of 0.147 K. Detailed analysis, similar to that done for macroscopic quantum tunnelling in superconducting junctions, yields parameters which accurately predict the mean value and the distribution width of the critical velocities at all temperatures. These observations establish the close relationship between this type of critical flow and negative ion motion in superfluid {sup 4}He and strongly suggest that the underlying mechanism is identical.}
place = {France}
year = {1992}
month = {Dec}
}
title = {Dissipative flow of superfluid {sup 4}He through a small orifice by quantum and thermal nucleation of vortices}
author = {Avenel, O, Ihas, G G, Aarts, R, and Varoquaux, E}
abstractNote = {Flow measurements in ultra-pure {sup 4}He through a micron-size orifice at millikelvin temperatures show the transition from thermal to quantum nucleation of nanometer-size vortices below a crossover temperature of 0.147 K. Detailed analysis, similar to that done for macroscopic quantum tunnelling in superconducting junctions, yields parameters which accurately predict the mean value and the distribution width of the critical velocities at all temperatures. These observations establish the close relationship between this type of critical flow and negative ion motion in superfluid {sup 4}He and strongly suggest that the underlying mechanism is identical.}
place = {France}
year = {1992}
month = {Dec}
}