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- Title
Hysteretic Critical State in Coplanar Josephson Junction with Monolayer Graphene Barrier.
- Authors
Massarotti, D.; Campagnano, G.; Giuliano, D.; Lucignano, P.; Stornaiuolo, D.; Pepe, G.; Tafuri, F.; Tagliacozzo, A.; Jouault, B.; Rouco, V.; Lombardi, F.
- Abstract
Coplanar Al/graphene/Al junctions fabricated on the same graphene sheet deposited on silicon carbide (SiC), show robust Josephson coupling at subKelvin temperature, when the separations between the electrodes is below 400 nm. Remarkably, a hysteretic Critical State sets in when ramping an orthogonal magnetic field, with a sudden collapse of the Josephson critical current I when turning the field on, and a revival of I when inverting the sweep. Similar hysteresis can be found in granular superconducting films which may undergo the Berezinskii-Kosterlitz-Thouless transition. Here, we give quantitative arguments to prove that this odd behavior of the magnetoconductance gives evidence for an incipient Berezinskii-Kosterlitz-Thouless transition with drift and pinning of fluctuating free vortices induced by the current bias.
- Subjects
JOSEPHSON effect; GRAPHENE; SILICON carbide; ELECTRODES; MAGNETIC fields
- Publication
Journal of Superconductivity & Novel Magnetism, 2017, Vol 30, Issue 1, p5
- ISSN
1557-1939
- Publication type
Article
- DOI
10.1007/s10948-016-3871-x