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Related Experiment Videos

Do columnar defects produce bulk pinning?

Indenbom1, van Der Beek CJ, Konczykowski

  • 1Laboratoire des Solides Irradies, Ecole Polytechnique, 91128 Palaiseau, France and Institute for Solid State Physics R.A.S., 142432 Chernogolovka, Moscow district, Russia.

Physical Review Letters
|October 4, 2000
PubMed
Summary
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Vortex motion in irradiated YBa2Cu3O7-delta crystals is limited by surface kink nucleation, not bulk pinning by defects. Bulk vortex movement relies on easy kink sliding, impacting screening currents mainly at higher fields.

Area of Science:

  • Superconductivity
  • Materials Science
  • Condensed Matter Physics

Background:

  • YBa2Cu3O7-delta is a high-temperature superconductor.
  • Heavy-ion irradiation creates columnar defects that can pin magnetic vortices.
  • Understanding vortex dynamics is crucial for superconducting applications.

Purpose of the Study:

  • To investigate vortex motion mechanisms in heavy-ion-irradiated YBa2Cu3O7-delta single crystals.
  • To determine the dominant factors limiting vortex depinning at specific fields and temperatures.
  • To elucidate the role of surface effects versus bulk pinning in vortex dynamics.

Main Methods:

  • Magneto-optical imaging was employed to observe vortex behavior.
  • Experiments were conducted on YBa2Cu3O7-delta single crystals subjected to heavy-ion irradiation.

Related Experiment Videos

  • Vortex dynamics were studied across a range of magnetic fields and temperatures.

    • Main Results:

    • Vortex motion was found to be limited by the nucleation of vortex kinks at the specimen surface.
    • In the bulk, vortex motion primarily occurs through easy kink sliding.
    • Bulk depinning significantly influences screening currents only at fields near or exceeding the matching field.

    Conclusions:

    • Surface effects, specifically kink nucleation, play a critical role in limiting vortex motion in these materials.
    • Bulk vortex dynamics are governed by kink sliding, with significant impact on screening currents occurring at higher magnetic fields.
    • The findings highlight the interplay between surface and bulk phenomena in controlling superconductivity in irradiated materials.