Geometry-related magnetic interference patterns in long S N S Josephson junctions

F. Chiodi 1 M. Ferrier 1 S. Gueron 1 J. C. Cuevas G. Montambaux 1 F. Fortuna 2 A. Kasumov 1 H. Bouchiat 1
1 LPS - Laboratoire de Physique des Solides
2 CSNSM PS2
CSNSM - Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse, CSNSM - Centre de Sciences Nucléaires et de Sciences de la Matière
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
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Article dans une revue
Physical Review B : Condensed matter and materials physics, American Physical Society, 2012, 86, pp.064510. 〈10.1103/PhysRevB.86.064510〉
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Contributeur : Christine Hadrossek <>
Soumis le : lundi 24 septembre 2012 - 15:24:21
Dernière modification le : jeudi 11 janvier 2018 - 06:27:04

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F. Chiodi, M. Ferrier, S. Gueron, J. C. Cuevas, G. Montambaux, et al.. Geometry-related magnetic interference patterns in long S N S Josephson junctions. Physical Review B : Condensed matter and materials physics, American Physical Society, 2012, 86, pp.064510. 〈10.1103/PhysRevB.86.064510〉. 〈in2p3-00734799〉

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