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Geometry-related magnetic interference patterns in long S N S Josephson junctions
Chiodi F., Ferrier M., Gueron S., C. Cuevas J., Montambaux G. et al
Physical Review B 86 (2012) 064510 - http://hal.in2p3.fr/in2p3-00734799
Physique/Matière Condensée/Science des matériaux
Sciences de l'ingénieur/Matériaux
Geometry-related magnetic interference patterns in long S N S Josephson junctions
F. Chiodi1, M. Ferrier1, S. Gueron1, J. C. Cuevas, G. Montambaux1, F. Fortuna2, A. Kasumov1, H. Bouchiat1
1 :  LPS - Laboratoire de Physique des Solides
http://www.lps.u-psud.fr/
CNRS : UMR8502 – Université Paris XI - Paris Sud
Bat. 510 91405 Orsay cedex
France
2 :  CSNSM - Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse
http://www-csnsm.in2p3.fr/
CNRS : UMR8609 – IN2P3 – Université Paris XI - Paris Sud
batiments 104 et 108 - 91405 Orsay Campus
France
CSNSM PS2
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.

Articles dans des revues avec comité de lecture
2012
Physical Review B
86
064510

CSNSM PS2, CSNSM INSTR
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