Dynamic transition in driven vortices across the peak effect in superconductors

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 $I_p$.

4 pages, 4 figures