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.
[Giuliano
Lab Charles Coulomb UMR 5221
[Lombardi
films
F.] Chalmers
supercurrent
weak links
D.] Univ Calabria Arcavacata Rende
SE-41296 Gothenburg
[Jouault
transition
[Giuliano
resistance
CNRS
B.] Univ Montpellier
I-87036 Cosenza
G.
Silicon carbide
Tagliacozzo
Josephson effect
P.
I-80126 Naples
Italy.
transport
France.
Lucignano
F-34095 Montpellier
I-87036 Cosenza
V.
Dept Microtechnol & Nanosci
transistors
Grp Coll Cosenza
Dipartimento Fis
Sweden.
Pepe
Monte S Angelo Via Cintia
D.
R SPIN
grain
A.] Univ Napoli
Italy.
D.
[Rouco
Stornaiuolo
Campagnano
Tagliacozzo
A.] INFN
Physics
Graphene
superconductivity
Italy.
phase
G. P.
Author
D. Massarotti
Superconductors, oxides and other innovative materials and devices
Università degli Studi della Campania Luigi Vanvitelli
B. Jouault
Laboratoire Charles Coulomb
V. Rouco
Universita degli Studi di Napoli Federico II
G. Campagnano
Universita degli Studi di Napoli Federico II
Superconductors, oxides and other innovative materials and devices
D. Giuliano
Universita della Calabria
Istituto Nazionale Di Fisica Nucleare, Frascati
P. Lucignano
Universita degli Studi di Napoli Federico II
Superconductors, oxides and other innovative materials and devices
D. Stornaiuolo
Universita degli Studi di Napoli Federico II
Superconductors, oxides and other innovative materials and devices
G. P. Pepe
Superconductors, oxides and other innovative materials and devices
Universita degli Studi di Napoli Federico II
Floriana Lombardi
Chalmers, Microtechnology and Nanoscience (MC2), Quantum Device Physics
F. Tafuri
Università degli Studi della Campania Luigi Vanvitelli
Superconductors, oxides and other innovative materials and devices
A. Tagliacozzo
Universita degli Studi di Napoli Federico II
Superconductors, oxides and other innovative materials and devices
Istituto Nazionale Di Fisica Nucleare, Frascati
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 (SSIF 2011)
Nano Technology
DOI
10.1007/s10948-016-3871-x