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Hysteretic Critical State in Coplanar Josephson Junction with Monolayer Graphene Barrier

D. Massarotti ; B. Jouault ; V. Rouco ; G. Campagnano ; D. Giuliano ; P. Lucignano ; D. Stornaiuolo ; G. P. Pepe ; Floriana Lombardi (Institutionen för mikroteknologi och nanovetenskap ; Institutionen för mikroteknologi och nanovetenskap, Kvantkomponentfysik) ; F. Tafuri ; A. Tagliacozzo
Journal of Superconductivity and Novel Magnetism (15571939). Vol. 30 (2017), 1, p. 5-14.
[Artikel, refereegranskad vetenskaplig]

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 Ic when turning the field on, and a revival of Ic 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. © 2016, Springer Science+Business Media New York.

Nyckelord: Graphene; Josephson effect; Silicon carbide

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Denna post skapades 2017-03-03.
CPL Pubid: 248388


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