Vortex-lattices in quasiperiodic pinning potentials

ORAL

Abstract

We have investigated vortex-lattice dynamics in superconducting Nb thin films with different types of quasiperiodic arrays of magnetic pinning centers. The mixed-state magnetoresistance show minima for particular applied fields, which reveal matching effects between the vortex-lattice and the quasiperiodic array. These minima are as sharp and well defined as those found with periodic pinning arrays. Moreover, a larger number of minima are observed for quasiperiodic arrays, which in some cases indicate a high ratio of vortices per pinning site. These results suggest that matching between the vortex-lattice and the array of magnetic dots takes place on a very local scale, indicating a short local correlation-length of the vortex-lattice.

*Work supported by US-NSF Grant DMR 03-53729. J.E.V. wants to acknowledge Spanish ``Ministerio de Educacion y Ciencia'' for a fellowship.

–

Authors

  • Javier E. Villegas

  • Maria I. Montero

  • Chang-Peng Li

  • Ivan K. Schuller

    • Physics Department, University of California-San Diego, 9500 Gilman Drive, La Jolla CA 92093-0319, USA
    • Physics Dept., Univ. Calif. San Diego, 9500 Gilman Dr., La Jolla CA 92093
    • Physics Department, UC San Diego, La Jolla, CA 92093
    • Physics department, University of California, San Diego, La Jolla
    • Department of Physics, University of California at San Diego, La Jolla CA 92093