| Issue |
J. Phys. Colloques
Volume 39, Number C6, Août 1978
The XVth International Conference on low temperature physicsQuantum Fluids and Solids Superconductivity |
|
|---|---|---|
| Page(s) | C6-681 - C6-682 | |
| DOI | https://doi.org/10.1051/jphyscol:19786304 | |
Quantum Fluids and Solids
Superconductivity
J. Phys. Colloques 39 (1978) C6-681-C6-682
DOI: 10.1051/jphyscol:19786304
ULTRASONIC SURFACE WAVE ATTENUATION BY INDUCED SUPERCONDUCTIVITY IN PbCu AND PbAg "SANDWICHES"
J.G. Park1, P. Tai1 and S. Freake21 Physics Department, Imperial College, London SW7 2BZ, U.K.
2 The Open University, Boar's Hill, Oxford, U.K.
Résumé
Nous avons mesuré entre 1,4 et 4,2 K l'amortissement des ondes ultrasoniques de surface causé par effet de proximité dans des "sandwiches" de plomb surmontés d'une couche de cuivre ou d'argent, en fonction de l'épaisseur et de la température. Un comportement systématique est observé dans les deux types d'échantillon qui ne paraît pas explicable en fonction des théories existantes.
Abstract
We have been making measurements between 1.4 and 4.2 K on the attenuation of ultrasonic surface waves produced by proximity effect "sandwiches", in which a superconducting Pb film is coated with a layer of Cu or Ag, as a function of layer thickness and temperature. A regular pattern of behaviour is observed for the two types of specimen which does not seem to be explicable by any of the existing theories.