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Dynamic instabilities and memory effects in vortex matter

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  • 1Department of Condensed Matter Physics, The Weizmann Institute of Science, Rehovot, Israel. hpalt@wis.weizmann.ac.il

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|February 10, 2000
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Summary
This summary is machine-generated.

A new model explains puzzling vortex motion in type II superconductors. It reveals how a disordered vortex phase at sample edges, annealed by current, creates memory effects, impacting vortex dynamics under different current types.

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Area of Science:

  • Condensed Matter Physics
  • Superconductivity
  • Materials Science

Background:

  • Type II superconductors exhibit complex vortex motion, with phenomena like history dependence and differing AC/DC responses challenging current models.
  • The magnetic flux line lattice in superconductors is a tunable system for studying condensed matter flow dynamics.

Purpose of the Study:

  • To elucidate the underlying mechanism behind puzzling vortex dynamics observed in type II superconductors.
  • To develop a generic model explaining history-dependent responses and differential mobility under AC and DC currents.

Main Methods:

  • Investigated current distribution across single crystals of Niobium Diselenide (NbSe2).
  • Developed a model based on the competition between disordered vortex phase injection at edges and current-driven dynamic annealing.
  • Analyzed the spatial dependence of the disordered vortex system under varying current conditions (AC vs. DC bias).

Main Results:

  • A novel mechanism involving a competition between disordered vortex phase injection and dynamic annealing explains observed phenomena.
  • Disordered phase is confined to sample edges under AC, allowing vortex motion, but dominates the sample under DC, enhancing pinning and preventing motion.
  • The model successfully accounts for low-frequency noise, voltage oscillations, history dependence, and suppressed AC response by DC bias.

Conclusions:

  • The interplay between edge effects and current-induced annealing of a disordered vortex phase provides a unified explanation for complex vortex dynamics.
  • The disordered vortex system exhibits spatial dependence, acting as an active memory of the applied current's history.
  • This mechanism reconciles previously incompatible observations regarding vortex mobility and response under different electrical stimuli.