Effect of submicron holes on the vortex dynamics of a superconducting microbridge (CROSBI ID 107958)
Prilog u časopisu | izvorni znanstveni rad | međunarodna recenzija
Podaci o odgovornosti
Bentner, Johannes ; Babić, Dinko ; Suergers, Christoph ; Strunk, Christoph
engleski
Effect of submicron holes on the vortex dynamics of a superconducting microbridge
We measured and compared the electric field vs current density characteristics in the vortex state of two amorphous Nb0.7Ge0.3 microbridges, with and without a line of submicron holes patterned along the sample axis. The power dissipation in the perforated sample exhibits a crossover, being reduced at temperatures well below the superconducting transition temperature Tc and unexpectedly enhanced close to Tc. At low temperatures the holes are efficient artificial pinning centres and reduce the average vortex velocity. We argue that the dissipation ehancement close to Tc is a consequence of a combination of the weakened pinning by the holes and an inhomogeneous driving current distribution in their vicinity, which results in an increased average vortex velocity as well as in a channeling of the vortex motion through the holes.
vortex ; flux flow ; nonequilibrium
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Podaci o izdanju
70 (18)
2004.
184516-1-184516-5
objavljeno
1098-0121
10.1103/PhysRevB.70.184516