Dynamic transition in driven vortices across the peak effect in superconductors

TL;DR

This paper investigates the dynamic transition from disordered to ordered vortex flow in type-II superconductors at zero temperature, highlighting how the transition current correlates with magnetic field and disorder strength.

Contribution

It provides new insights into the behavior of transition current and defect concentration during the vortex flow transition, especially across the peak effect regime.

Findings

Transition current $I_{p}$ shows a sharp kink in $V(I)$ characteristic.

$I_{p}(B)$ increases rapidly in the peak effect regime.

Disorder strength influences the transition current $I_{p}$.

Abstract

We study the zero-temperature dynamic transition from the disordered flow to an ordered flow state in driven vortices in type-II superconductors. The transition current $I_{p}$ is marked by a sharp kink in the $V(I)$ characteristic with a concomitant large increase in the defect concentration. On increasing magnetic field $B$, the $I_{p}(B)$ follows the behaviour of the critical current $I_{c}(B)$. Specifically, in the peak effect regime $I_{p}(B)$ increases rapidly along with $I_{c}$. We also discuss the effect of varying disorder strength on $I_{p}$.