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
2 CSNSM PS2
CSNSM - Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse
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.
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Journal articles
Physical Review B, 2012, 86, pp.064510. <10.1103/PhysRevB.86.064510>


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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, 2012, 86, pp.064510. <10.1103/PhysRevB.86.064510>. <in2p3-00734799>

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