Vortex kinks in superconducting films with periodically modulated thickness
Abstract
We report magnetoresistance measurements in Nb films having a periodic thickness modulation. The cylinder shaped thicker regions of the sample, which form a square lattice, act as repulsive centers for the superconducting vortices. For low driving currents along one of the axes of the square lattice, the resistivity ρ increases monotonously with increasing magnetic field B and the ρB characteristics are approximately piecewise linear. The linear ρ versus B segments change their slope at matching fields where the number of vortices is an integer or a half integer times the number of protruding cylinders in the sample. Numerical simulations allow us to associate the different segments of linear magnetoresistance to different vortexflow regimes, some of which are dominated by the propagation of discommensurations (kinks).
 Publication:

Journal of Physics Condensed Matter
 Pub Date:
 June 2013
 DOI:
 10.1088/09538984/25/24/245701
 arXiv:
 arXiv:1208.4820
 Bibcode:
 2013JPCM...25x5701F
 Keywords:

 Condensed Matter  Superconductivity
 EPrint:
 Journal of Physics Condensed Matter 2013