Strongly nonequilibrium flux flow in the presence of perforating submicron holes

TL;DR

This study investigates how perforating submicron holes affect vortex dynamics in amorphous NbGe microbridges under strong nonequilibrium conditions, revealing temperature-dependent dissipation behaviors and vortex property changes.

Contribution

It provides new insights into vortex behavior and dissipation in superconductors with engineered perforations under strong nonequilibrium states.

Findings

Enhanced dissipation regardless of temperature in strong nonequilibrium

Vortex shrinking near Tc due to Larkin-Ovchinnikov mechanism

Weakening of flux pinning at low temperatures due to electron heating

Abstract

We report on the effects of perforating submicron holes on the vortex dynamics of amorphous Nb0.7Ge0.3 microbridges in the strongly nonequilibrium mixed state, when vortex properties change substantially. In contrast to the weak nonequilibrium - when the presence of holes may result in either an increase (close to Tc) or a decrease (well below Tc) of the dissipation, in the strong nonequilibrium an enhanced dissipation is observed irrespectively of the bath temperature. Close to Tc this enhancement is similar to that in the weak nonequilibrium, but corresponds to vortices shrunk due to the Larkin-Ovchinnikov mechanism. At low temperatures the enhancement is a consequence of a weakening of the flux pinning by the holes in a regime where electron heating dominates the superconducting properties.