Nonuniform self-organized dynamical states in superconductors with periodic pinning.

  title={Nonuniform self-organized dynamical states in superconductors with periodic pinning.},
  author={Vyacheslav R. Misko and Sergey E Savel'ev and A. L. Rakhmanov and Franco Nori},
  journal={Physical review letters},
  volume={96 12},
We consider magnetic flux moving in superconductors with periodic pinning arrays. We show that sample heating by moving vortices produces negative differential resistivity (NDR) of both N and S type (i.e., N- and S-shaped) in the voltage-current characteristic (VI curve). The uniform flux flow state is unstable in the NDR region of the VI curve. Domain structures appear during the NDR part of the VI curve of an N type, while a filamentary instability is observed for the NDR of an S type. The… 

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