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Materials like iron, nickel, and cobalt consist of magnetic domains, within which the magnetic dipoles are arranged parallel to each other. The magnetic dipoles are rigidly aligned in the same direction within a domain by quantum mechanical coupling among the atoms. This coupling is so strong that even thermal agitation at room temperature cannot break it. The result is that each domain has a net dipole moment. However, some materials have weaker coupling, and are ferromagnetic at lower...
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Jamming, fragility and pinning phenomena in superconducting vortex systems.

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We found four behaviors of driven superconducting vortices interacting with disorder, distinguished by memory effects. Fragile and jammed states show memory, while elastic and pinning-dominated regimes do not.

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Area of Science:

  • Condensed Matter Physics
  • Superconductivity

Background:

  • Driven superconducting vortices are crucial in understanding.
  • Quenched disorder influences vortex dynamics significantly.

Purpose of the Study:

  • To investigate the behavior of driven superconducting vortices under quenched disorder.
  • To identify distinct phases based on memory effects.

Main Methods:

  • Applying a sequence of perpendicular drive pulses.
  • Analyzing spatial vortex configurations.
  • Varying disorder strength.

Main Results:

  • Identified four distinct behaviors: fragile, jammed, elastic, and pinning-dominated.
  • Fragile and jammed states exhibit memory effects.
  • Memory effects correlate with coexisting elastic and pinned vortex components.

Conclusions:

  • The proposed driving protocol can distinguish between vortex phases.
  • Findings offer insights into driven interacting particle systems with disorder.