A new singularity in the coherent coupling in Al/GaAs/Al SNS junctions at the bias voltage corresponding to the superconducting energy gap

Rafael Jozef Taboryski, Jonatan Kutchinsky, Oliver Kuhn, Poul Erik Lindelof, Claus B. Sørensen, Anders Kristensen, Claus Schelde Jacobsen, Jørn Bindslev Hansen, Johannes Skov

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Abstract

Particularly high transmittivity superconductor-semiconductor barriers formed by MBE growth have been used to form short Josephson planar type Superconductor-Normal-metal-Superconductor (SNS) Josephson junctions with lengths down to 1 mu m. In these junctions the quasiparticles move diffusively across the normal region and carry along the phase information given to them by Andreev reflections at both SN boundaries. In order to probe the importance of the coherent transport of quasiparticles in the normal region, we formed one of the superconducting electrodes of the junction as an open loop i.e. an SNS1S2 junction. The total transmission probability through this junction which is modulated by the external magnetic flux through the loop, depends on the coherence of the trajectories going across from S to S-1 and from S to S-2. Oscillations of the conductance in this type of sample versus magnetic field was observed both at V-DC = 0 and V-DC = Delta/e = 163 mu V. At intermediate as well as higher voltages no oscillations were observed. (C) 1998 Elsevier Science B.V. All rights reserved.
Original languageEnglish
JournalPhysica B: Condensed Matter
Volume249-251
Pages (from-to)480-484
ISSN0921-4526
Publication statusPublished - 1998

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