Dynamic ordering and frustration of confined vortex rows studied by mode-locking experiments

Abstract

The flow properties of confined vortex matter driven through disordered mesoscopic channels are investigated by mode locking (ML) experiments. The observed ML effects allow to trace the evolution of both the structure and the number of confined rows and their match to the channel width as function of magnetic field. From a detailed analysis of the ML behavior for the case of 3-rows we obtain ({\it i}) the pinning frequency $f_p$, ({\it ii}) the onset frequency $f_c$ for ML ($\propto$ ordering velocity) and ({\it iii}) the fraction $L_{ML}/L$ of coherently moving 3-row regions in the channel. The field dependence of these quantities shows that, at matching, where $L_{ML}$ is maximum, the pinning strength is small and the ordering velocity is low, while at mismatch, where $L_{ML}$ is small, both the pinning force and the ordering velocity are enhanced. Further, we find that $f_c\propto f_p^2$, consistent with the dynamic ordering theory of Koshelev and Vinokur. The microscopic nature of the flow and the ordering phenomena will also be discussed.

10 pages, 7 figure, submitted to PRB. Discussion has been improved and a figure has been added

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• Single File Diffusion of particles with long ranged interactions: damping and finite size effects
• Single file diffusion of macroscopic charged particles
• Depinning and dynamics of vortices confined in mesoscopic flow channels
• Pinning effects on self-heating and flux-flow instability in superconducting films near $T_c$
• Vortex configurations and dynamics in elliptical pinning sites for high matching fields
• Single File Diffusion enhancement in a fluctuating modulated 1D channel
• Pinning effects on flux flow instability in epitaxial Nb thin films
• Dynamic mode locking in a driven colloidal system: experiments and theory
• Enhancement of mobilities in a pinned multidomain crystal
• Subharmonic Shapiro steps of sliding colloidal monolayers in optical lattices
• Effective interactions and melting of a one dimensional defect lattice within a two-dimensional confined colloidal solid
• Anisotropic finite-size scaling of an elastic string at the depinning threshold in a random-periodic medium
• Flow and Tilt-Induced Orientation of the Moving Vortex Lattice in Amorphous NbGe Superconducting Thin Films
• Reentrant Pinning, Dynamic Row Reduction, and Skyrmion Accumulation for Driven Skyrmions in Inhomogeneous Pinning Arrays
• Vortex Shear Banding Transitions in Superconductors with Inhomogeneous Pinning Arrays