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Dynamical regimes of vortex flow in type-II superconductors with parallel twin boundaries

  • Harshwardhan Chaturvedi
  • Nathan Galliher
  • Ulrich Dobramysl
  • Michel Pleimling
  • Uwe C. Täuber
Regular Article
  • 24 Downloads

Abstract

We explore the dynamics of driven magnetic flux lines in disordered type-II superconductors in the presence of twin boundaries oriented parallel to the direction of the applied magnetic field, using a three-dimensional elastic line model simulated with Langevin molecular dynamics. The lines are driven perpendicular to the planes to model the effect of an electric current applied parallel to the planes and perpendicular to the magnetic field. A study of the long-time non-equilibrium steady states for varying sample orientation and thickness reveals a rich collection of dynamical regimes spanning the depinning crossover region that separates the pinned and moving-lattice states of vortex matter. We observe the emergence of a preferred direction for the ordering of the Abrikosov lattice in the free-flowing vortex regime due to asymmetric pinning by the planar defects. We have performed novel direct measurements of flux line excitations such as half-loops and double kinks to aid the characterization of the topologically rich flux flow profile.

Keywords

Statistical and Nonlinear Physics 

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Copyright information

© EDP Sciences, SIF, Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Department of Physics and Center for Soft Matter and Biological Physics (MC 0435)Virginia TechUSA
  2. 2.Department of Physics and AstronomyUniversity of North CarolinaChapel HillUSA
  3. 3.Wellcome Trust/CRUK Gurdon Institute, University of CambridgeCambridgeUK
  4. 4.Academy of Integrated Science (MC 0405)Virginia TechUSA

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