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Vortex entanglement in disordered superconductors

Samokhin1

  • 1Cavendish Laboratory, University of Cambridge, Madingley Road, Cambridge CB3 0HE, United Kingdom.

Physical Review Letters
|October 4, 2000
PubMed
Summary
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Vortex entanglement in superconductors is affected by disorder. Columnar disorder enhances vortex winding, while point disorder suppresses it, creating a temperature-dependent pinning force.

Area of Science:

  • Condensed matter physics
  • Superconductivity research
  • Vortex dynamics

Background:

  • Understanding vortex behavior is crucial for superconductor applications.
  • Disorder in superconductors significantly impacts vortex pinning and entanglement.
  • Multiply connected geometries present unique challenges for vortex confinement.

Purpose of the Study:

  • To investigate the influence of quenched columnar and point disorder on vortex entanglement and pinning.
  • To analyze the temperature dependence of the effective pinning force in disordered superconductors.
  • To compare vortex behavior in disordered versus clean superconducting systems.

Main Methods:

  • Theoretical study of vortex entanglement and pinning.
  • Analysis of vortex winding around repulsive obstacles in the presence of disorder.

Related Experiment Videos

  • Mathematical modeling of effective pinning forces.

    • Main Results:

    • Quenched columnar disorder significantly enhances vortex winding around obstacles.
    • Point disorder suppresses vortex winding compared to the clean superconducting case.
    • An additional pinning force contribution is identified, which increases with temperature.

    Conclusions:

    • Disorder type critically dictates vortex entanglement and pinning characteristics.
    • The temperature-dependent pinning force offers new insights into vortex dynamics in superconductors.
    • Findings contribute to the fundamental understanding of disordered superconducting states.