 |
Journal articles
Geometry-related magnetic interference patterns in long S N S Josephson junctions
Abstract : 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.
Mots-clés :
SUPERCONDUCTIVITY
http://hal.in2p3.fr/in2p3-00734799
Contributor : Christine Hadrossek Connect in order to contact the contributor
Submitted on : Monday, September 24, 2012 - 3:24:21 PM
Last modification on : Tuesday, June 22, 2021 - 3:43:11 AM
Contributor : Christine Hadrossek Connect in order to contact the contributor
Submitted on : Monday, September 24, 2012 - 3:24:21 PM
Last modification on : Tuesday, June 22, 2021 - 3:43:11 AM
Links full text
