| Thème(s) : |
 |
|
|
| Titre : |
|
Geometry-related magnetic interference patterns in long S N S Josephson junctions |
|
| Auteur : |
|
F. Chiodi1, M. Ferrier1, S. Gueron1, J. C. Cuevas, G. Montambaux1, F. Fortuna2, A. Kasumov1, H. Bouchiat1 |
|
| Laboratoire : |
|
|
|
| équipe(s) de recherche : |
|
CSNSM PS2 |
| Résumé : |
|
We have measured the critical current dependence on the magnetic flux of two long S N S junctions differing by the normal wire geometry. The samples are made by a Au wire connected to W contacts, via focused ion beam assisted deposition. We could tune the magnetic pattern from the monotonic Gaussian-like decay of a quasi-one-dimensional (1D) normal wire to the Fraunhofer-like pattern of a square normal wire. We explain the monotonic limit with a semiclassical 1D model, and we fit both field dependencies with numerical simulations of the two-dimensional Usadel equations. Furthermore, we observe both integer and fractional Shapiro steps. The magnetic flux dependence of the integer steps reproduces as expected that of the critical current I-c, while fractional steps decay slower with the flux than I-c. |
|
|
| Type de publication : |
|
Articles dans des revues avec comité de lecture |
|
Date de publication
ou d'écriture : |
|
2012 |
|
| Nom du périodique : |
|
Physical Review B |
|
| Volume : |
|
86 |
|
| Page/Article : |
|
064510 |
|
|
| Identifiant local : |
|
CSNSM PS2, CSNSM INSTR |
|
| Mot(s)-clé(s) : |
|
SUPERCONDUCTIVITY |
|
Récupérer au format
