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Correlation length of quasiperiodic vortex lattices.

J E Villegas1, M I Montero, C-P Li

  • 1Physics Department, University of California, San Diego, 9500 Gilman Drive, La Jolla, 92093-0319, USA.

Physical Review Letters
|August 16, 2006
PubMed
Summary

Superconducting vortex-lattice dynamics were studied in niobium thin films with quasiperiodic magnetic pinning centers. Matching effects were observed, with fractal arrays showing enhanced vortex-lattice correlation and deeper magnetoresistance minima, approaching periodic array behavior.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Superconductivity

Background:

  • Vortex-lattice dynamics are crucial for understanding superconductivity in applied magnetic fields.
  • Pinning centers influence vortex behavior and critical current densities in superconductors.

Purpose of the Study:

  • To investigate vortex-lattice dynamics in superconducting niobium (Nb) thin films.
  • To explore the impact of quasiperiodic arrays of magnetic pinning centers on vortex-lattice matching effects.

Main Methods:

  • Fabrication of Nb thin films with various quasiperiodic magnetic pinning center arrays.
  • Measurement of mixed-state magnetoresistance under applied magnetic fields.
  • Analysis of vortex-lattice matching effects and correlation lengths.

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Main Results:

  • Magnetoresistance minima were observed at specific applied fields, indicating matching effects.
  • Critical matching effects were found to be locally originating.
  • Fractal pinning arrays resulted in a longer vortex-lattice correlation length and deeper magnetoresistance minima compared to other quasiperiodic arrays.

Conclusions:

  • Quasiperiodic pinning arrays significantly influence vortex-lattice dynamics in superconducting Nb films.
  • Fractal arrays demonstrate a unique ability to enhance vortex-lattice order and matching effects.
  • These findings offer insights into controlling vortex behavior for potential applications in superconducting devices.