Naslov
Effect of submicron holes on the vortex dynamics of a superconducting microbridge

Autori
Bentner, Johannes ; Babić, Dinko ; Suergers, Christoph ; Strunk, Christoph

Izvornik
Physical Review B - Condensed Matter and Materials Physics (1098-0121) 70 (2004), 18; 184516-1

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
vortex ; flux flow ; nonequilibrium

Sažetak
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.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

POVEZANOST RADA