Dynamics of a Driven Single Flux Line in Superconductors

TL;DR

This paper investigates the behavior of a single flux line in a superconductor under surface current drive, revealing a velocity discontinuity above a critical driving threshold.

Contribution

It provides new insights into flux line dynamics, especially the velocity profile discontinuity that occurs at the instability threshold.

Findings

Velocity profile develops a discontinuity above critical drive

Instability onset characterized by a sudden change in flux line motion

Analysis enhances understanding of flux line behavior in superconductors

Abstract

We study the low temperature dynamics of a single flux line in a bulk type-II superconductor, driven by a surface current, both near and above the onset of an instability which sets in at a critical driving. We found that above the critical driving, the velocity profile of the flux line develops a discontinuity.