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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 (1557-1939). 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 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.

Nyckelord: Graphene, Josephson effect, Silicon carbide, weak links, superconductivity, supercurrent, transistors, transition, phase, films, resistance, transport, grain, R SPIN, Monte S Angelo Via Cintia, I-80126 Naples, Italy., [Jouault, B.] Univ Montpellier, CNRS, Lab Charles Coulomb UMR 5221, F-34095 Montpellier, France., [Rouco, V., Campagnano, G., Lucignano, P., Stornaiuolo, D., Pepe, G. P., Tagliacozzo, A.] Univ Napoli, [Giuliano, D.] Univ Calabria Arcavacata Rende, Dipartimento Fis, I-87036 Cosenza, Italy., [Giuliano, D., Tagliacozzo, A.] INFN, Grp Coll Cosenza, I-87036 Cosenza, Italy., [Lombardi, F.] Chalmers, Dept Microtechnol & Nanosci, SE-41296 Gothenburg, Sweden., Physics



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Denna post skapades 2017-02-15. Senast ändrad 2017-04-28.
CPL Pubid: 248143

 

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