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 5-14

Driving Forces

Sustainable development

Areas of Advance

Nanoscience and Nanotechnology

Subject Categories

Nano Technology

Condensed Matter Physics

DOI

10.1007/s10948-016-3871-x

More information

Latest update

4/6/2022 6