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Author (up) Facio, J.I.; Abate, A.; Guimpel, J.; Cornaglia, P.S.
Title Vortex kinks in superconducting films with periodically modulated thickness Type Journal Article
Year 2013 Publication Journal of Physics: Condensed Matter Abbreviated Journal J. Phys.: Cond. Matter
Volume 25 Issue 24 Pages 245701
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 ρ– B 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 vortex-flow regimes, some of which are dominated by the propagation of discommensurations (kinks).
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ISSN 0953-8984 ISBN Medium
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Call Number BT @ pedrazp @ Serial 672
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