Hysteretic Critical State in Coplanar Josephson Junction with Monolayer Graphene Barrier
Journal article, 2017
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 (c) when turning the field on, and a revival of I (c) 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.
Josephson effect
Graphene
Silicon carbide
Author
D. Massarotti
University of Campania Luigi Vanvitelli
Superconductors, oxides and other innovative materials and devices
B. Jouault
Laboratoire Charles Coulomb
V. Rouco
University of Naples Federico II
G. Campagnano
University of Naples Federico II
Superconductors, oxides and other innovative materials and devices
D. Giuliano
National Institute for Nuclear Physics
University of Calabria
P. Lucignano
University of Naples Federico II
Superconductors, oxides and other innovative materials and devices
D. Stornaiuolo
University of Naples Federico II
Superconductors, oxides and other innovative materials and devices
G. P. Pepe
University of Naples Federico II
Superconductors, oxides and other innovative materials and devices
Floriana Lombardi
Chalmers, Microtechnology and Nanoscience (MC2), Quantum Device Physics
F. Tafuri
Superconductors, oxides and other innovative materials and devices
University of Campania Luigi Vanvitelli
A. Tagliacozzo
University of Naples Federico II
Superconductors, oxides and other innovative materials and devices
National Institute for Nuclear Physics
Journal of Superconductivity and Novel Magnetism
1557-1939 (ISSN) 1557-1947 (eISSN)
Vol. 30 1 5-14Driving Forces
Sustainable development
Areas of Advance
Nanoscience and Nanotechnology
Subject Categories
Nano Technology
Condensed Matter Physics
DOI
10.1007/s10948-016-3871-x