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Spontaneous pattern formation in superconducting films.

W Y Córdoba-Camacho1, R M da Silva2, A A Shanenko2

  • 1National Research University Higher School of Economics, Moscow, 101000, Russia.

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|November 2, 2019
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Summary
This summary is machine-generated.

Superconducting films exhibit unique magnetic patterns due to stray fields, challenging conventional type I and type II classifications. These spontaneous flux-condensate patterns are not an artifact of calculation boundary conditions.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science

Background:

  • Superconducting films are often classified as type II due to stray magnetic fields, even if made of type I materials.
  • A thickness interval exists where films don't fit conventional type I or II superconductivity classifications.

Purpose of the Study:

  • To investigate the magnetic properties of superconducting films in a specific thickness range.
  • To determine if spontaneous magnetic flux-condensate patterns are an artifact of periodic boundary conditions.

Main Methods:

  • Theoretical calculations of superconducting film magnetic properties.
  • Comparison of results using periodic versus open in-plane boundary conditions.

Main Results:

  • Spontaneous formation of magnetic flux-condensate patterns and superstructures observed.
  • These patterns arise from the interplay of stray fields and proximity to the Bogomolnyi self-duality point.
  • Similar patterns are obtained with open boundary conditions, indicating robustness.

Conclusions:

  • The observed spontaneous patterns in superconducting films are a genuine phenomenon, not an artifact of periodic boundary conditions.
  • This expands understanding beyond conventional type I and type II superconductivity classifications.