| Issue |
J. Phys. Colloques
Volume 39, Number C6, Août 1978
The XVth International Conference on low temperature physicsQuantum Fluids and Solids Superconductivity |
|
|---|---|---|
| Page(s) | C6-153 - C6-155 | |
| DOI | https://doi.org/10.1051/jphyscol:1978668 | |
The XVth International Conference on low temperature physics
Quantum Fluids and Solids
Superconductivity
J. Phys. Colloques 39 (1978) C6-153-C6-155
DOI: 10.1051/jphyscol:1978668
1 Groupe de Physique des Solides de l'E.N.S., 24, rue Lhomond, 75005 Paris, France
2 Brookhaven National Laboratory, Upton, N.Y. 11973, U.S.A.
3 Department of Physics and Centre for Materials Science and Engineering, M.I.T., Cambridge Massachussetts, 02139, U.S.A.
Quantum Fluids and Solids
Superconductivity
J. Phys. Colloques 39 (1978) C6-153-C6-155
DOI: 10.1051/jphyscol:1978668
ORDER PARAMETER RELAXATION NEAR Tλ: AN HIGH FREQUENCY EXPERIMENTAL TEXT IN LIQUID HELIUM
F. Vidal1, J.A. Tarvin2 and T.J. Greytak31 Groupe de Physique des Solides de l'E.N.S., 24, rue Lhomond, 75005 Paris, France
2 Brookhaven National Laboratory, Upton, N.Y. 11973, U.S.A.
3 Department of Physics and Centre for Materials Science and Engineering, M.I.T., Cambridge Massachussetts, 02139, U.S.A.
Résumé
Nous avons mesuré l'atténuation et la vitesse du premier son de haute fréquence (~ 1 GHz) près de Tλ dans 1'4He liquide sous pression. Nos résultats sont en désaccord avec les analyses phénoménologiques valables aux basses fréquences, basés sur la relaxation du paramètre d'ordre.
Abstract
We have measured the attenuation and the dispersion of high-frequency first sound (~ 1 GHz) near Tλ in liquid 4He under pressure. Our results disagree with the phenomenological treatments currently used to explain the low frequency data and based on the order parameter relaxation.