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We report an experimental and numerical study of magneto-transport properties of mesoscopic lateral S/N/S superconducting weak links where the N region is made of the same material as the S banks, though with strongly reduced critical temperature. Magnetoresistance oscillations and clear dc and ac Josephson effects are observed. Experimental results are analyzed in the framework of the time-dependent Ginzburg–Landau model for mesoscopic type II superconductors with an inhomogeneous critical temperature. The analysis suggests that dissipative branches of the current–voltage curve of the weak link in the presence of a magnetic field are accounted for by moving'Josephson-like'vortices. These relatively fast excitations are anisotropic as per the ordinary Josephson vortex in tunnel junctions, but have a normal core like the ordinary Abrikosov vortex in plain superconducting strips. Moreover, unlike the …
IOP Publishing
Publication date: 
29 Dec 2016

G Carapella, P Sabatino, M Gombos

Biblio References: 
Volume: 30 Issue: 2 Pages: 025018
Superconductor Science and Technology