What happens in Josephson junctions at high critical current densities
D. Massarotti1,2, D. Stornaiuolo1,2, P. Lucignano1,2, R. Caruso1,2, L. Galletti3, D. Montemurro3, B. Jouault4, G. Campagnano1,2, H.F. Arani5,1
L. Longobardi6, L. Parlato1,2, G.P. Pepe1,2, G. Rotoli7, A. Tagliacozzo1,2, F. Lombardi3, and F. Tafuri1,2
1Dipartimento di Fisica E. Pancini, Universitá di Napoli Federico II, Monte S. Angelo via Cinthia, 80126 Napoli, Italy
2CNR-SPIN UOS Napoli, Monte S. Angelo via Cinthia, 80126 Napoli, Italy
3Department of Microtechnology and Nanoscience, Chalmers University of Technology, SE-412 96 Göteborg, Sweden
4Laboratoire Charles Coulomb (L2C), UMR 5221 CNRS-Université de Montpellier, F-34095 Montpellier, France
5Department of Materials Engineering, Engineering Faculty, Imam Khomeini International University, Qazvin, Iran
6American Physical Society, 1 Research Road, Ridge, New York 11961, USA
7Dipartimento di Ingegneria Industriale e dell’Informazione, Università degli Studi della Campania Luigi Vanvitelli, I-81031 Aversa (CE), Italy
Received March 4, 2017
The impressive advances in material science and nanotechnology are more and more promoting the use of exotic barriers and/or superconductors, thus paving the way to new families of Josephson junctions. Semiconducting, ferromagnetic, topological insulator and graphene barriers are leading to unconventional and anomalous aspects of the Josephson coupling, which might be useful to respond to some issues on key problems of solid state physics. However, the complexity of the layout and of the competing physical processes occurring in the junctions is posing novel questions on the interpretation of their phenomenology. We classify some significant behaviors of hybrid and unconventional junctions in terms of their first imprinting, i.e. current-voltage curves, and propose a phenomenological approach to describe some features of junctions characterized by relatively high critical current densities Jc. Accurate arguments on the distribution of switching currents will provide quantitative criteria to understand physical processes occurring in high-Jc junctions. These notions are universal and apply to all kinds of junctions.
PACS: 74.72.–h Cuprate superconductors;
Key words: Josephson junctions, phase dynamics, hybrid devices, vortex flow.
Published online: May 25, 2017
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ISSN: 0132-6414 (Print) | ISSN: 1816-0328 (Online)