title: Correlation length of quasiperiodic vortex lattices.
abstract: We investigated vortex-lattice dynamics in superconducting Nb thin films with different quasiperiodic arrays of magnetic pinning centers. The mixed-state magnetoresistance exhibits minima for well-defined applied fields, related to matching effects between the vortex lattice and those arrays. The results show that critical matching can originate at a local scale. For fractal arrays, the vortex-lattice correlation length is longer and the minima are deeper, close to those of periodic arrays.
authors.affiliation: Physics Department, University of California, San Diego, 9500 Gilman Drive, La Jolla, 92093-0319, USA.
authors.forename: J E
authors.initials: JE
authors.lastname: Villegas
authors.forename: M I
authors.initials: MI
authors.lastname: Montero
authors.forename: C-P
authors.initials: CP
authors.lastname: Li
authors.forename: Ivan K
authors.initials: IK
authors.lastname: Schuller