Proximity effects and Andreev reflection in mesoscopic SNS junction with perfect NS interfaces
Z. D. Kvon (1), T. I. Baturina (1), R. A. Donaton (2), M. R. Baklanov, (1, 2), K. Maex (2), E. B. Olshanetsky (1) A. E. Plotnikov (1) J. C., Portal (3) ((1) Institute of Semiconductor Physics, Novosibirsk, Russia, (2), IMEC, Belgium, (3)CNRS-LCMI, Grenoble, France)
TL;DR
This study investigates proximity effects and Andreev reflections in mesoscopic SNS junctions with perfect NS interfaces, revealing how wire length influences the manifestation of subharmonic energy gap structures.
Contribution
It provides experimental insights into how wire length affects proximity effects and Andreev reflections in SNS junctions with perfect interfaces.
Findings
Zero bias resistance dip observed in all junctions.
Subharmonic energy gap structure appears only in short wire junctions.
Longer wires suppress phase coherent multiple Andreev reflections.
Abstract
Low temperature transport measurements on superconducting film - normal metal wire - superconducting film (SNS) junctions fabricated on the basis of 6 nm thick superconducting polycrystalline PtSi films are reported. The structures with the normal metal wires of two different lengths L=1.5 m and L=6m and the same widths W=0.3m are studied. Zero bias resistance dip related to pair current proximity effect is observed for all junctions whereas the subharmonic energy gap structure originating from phase coherent multiple Andreev reflections have occurs only in the SNS junctions with short wires.
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