| Issue |
J. Phys. Colloques
Volume 39, Number C6, Août 1978
The XVth International Conference on low temperature physicsQuantum Fluids and Solids Superconductivity |
|
|---|---|---|
| Page(s) | C6-302 - C6-303 | |
| DOI | https://doi.org/10.1051/jphyscol:19786133 | |
Quantum Fluids and Solids
Superconductivity
J. Phys. Colloques 39 (1978) C6-302-C6-303
DOI: 10.1051/jphyscol:19786133
DISSIPATION IN THE SUPERFLUID FILM BELOW IK
J.G.M. Armitage1, J.F. Allen1 and M. Toft21 Department of Physics, University of St Andrews North Haugh, St Andrews, Scotland
2 CEGB, Scientific Services Department, Withenshaw, Manchester, England.
Résumé
Nous avons mesuré la vitesse du film d'hélium superfluide aux températures 11 mK - 1 K. Si la différence de hauteur du niveau liquide, Ɗh, est moins que 50 µm la dissipation augmente rapidement mais plus lentement que exp(-vB /vs). Au-dessous de 20 mK, nous observons que la dissipation a un terme ∝ vs. A toutes les temperatures les vitesses sont discrètes et très stables si Ɗh est plus grand que 50 µm.
Abstract
We have measured the transfer rate of the surperfluid helium film at temperatures from 11 mK to 1 K. If the level difference, ∝h, is less than 50 µm the dissipation rises rapidly but more slowly than exp(-vB /vs). Below 20 mK, we observe that the dissipation has a term ∝ vs. At all temperatures there are very stable discrete rates if Ɗh is greater than 50 µm.