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Related Experiment Videos

Mode locking of vortex matter driven through mesoscopic channels.

N Kokubo1, R Besseling, V M Vinokur

  • 1Kamerlingh Onnes Laboratory, Leiden University, P.O. Box 9504, 2300 RA Leiden, The Netherlands.

Physical Review Letters
|June 13, 2002
PubMed
Summary

Investigating vortex dynamics in mesoscopic channels reveals how vortex row number and lattice structure change with magnetic field, impacting flow stress. Coherent motion minimizes stress, while mixed configurations maximize it due to pinning effects.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Superconductivity

Background:

  • Vortex dynamics in confined geometries are crucial for understanding phenomena like superconductivity and fluid flow.
  • Mesoscopic flow channels introduce boundary effects that significantly influence vortex behavior and stability.
  • The interplay between vortex lattice structure and external fields dictates macroscopic properties.

Purpose of the Study:

  • To investigate the driven dynamics of vortices confined within mesoscopic flow channels.
  • To elucidate the relationship between magnetic field, vortex row number, lattice structure, and flow stress.
  • To understand the pinning mechanisms responsible for enhanced flow stress.

Main Methods:

  • Utilized a dc-rf interference technique to probe vortex dynamics.

Related Experiment Videos

  • Analyzed current-voltage (IV) curves to observe mode-locking steps.
  • Performed simulations to investigate pinning mechanisms and vortex configurations.

    • Main Results:

    • Observed distinct mode-locking steps in IV curves, correlating with changes in vortex row number and lattice structure.
    • Identified minima in flow stress during coherent motion of integer vortex rows.
    • Found maxima in flow stress associated with incoherent motion of mixed vortex row configurations (n and n+/-1).

    Conclusions:

    • The number of vortex rows and their lattice structure are tunable by magnetic field.
    • Flow stress is minimized by coherent vortex motion and maximized by disordered configurations.
    • Enhanced pinning at mismatch arises from quasistatic fault zones induced by channel edge disorder.