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Peak effect in polycrystalline vortex matter.

I K Dimitrov1, N D Daniilidis, C Elbaum

  • 1Department of Physics, Brown University, Providence, Rhode Island 02912, USA.

Physical Review Letters
|August 7, 2007
PubMed
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This study investigates the peak effect in disordered type-II superconductors using magnetic susceptibility and neutron scattering. Findings reveal no long-range vortex order, suggesting a remnant Bragg glass transition on submicron scales due to atomic disorder.

Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Superconductivity

Background:

  • Type-II superconductors exhibit complex vortex states influenced by disorder.
  • The peak effect in superconductors is a phenomenon observed in their phase diagrams.
  • Atomic disorder significantly impacts the behavior of vortices in superconducting materials.

Purpose of the Study:

  • To investigate the peak-effect phase diagram of a strongly disordered type-II superconductor, Vanadium-Titanium (V-21 at.%Ti).
  • To characterize the vortex states and their ordering in the presence of significant atomic disorder.
  • To understand the origin of the peak effect in this disordered superconducting system.

Main Methods:

  • Utilized AC magnetic susceptibility measurements to probe superconducting properties.

Related Experiment Videos

  • Employed small-angle neutron scattering (SANS) to analyze vortex lattice structure.
  • Investigated vortex states under field-cooled thermal histories.

    • Main Results:

    • The peak effect was observed only at magnetic fields exceeding 3.4 Tesla.
    • No long-range orientationally ordered vortex lattices were detected, even deep in the mixed state or near the peak effect.
    • Small-angle neutron scattering revealed vortex states with order on a sub-micron length scale.

    Conclusions:

    • The observed peak effect is conjectured to be a remnant of the Bragg glass disordering transition.
    • This transition occurs on submicron length scales due to the strong atomic disorder present in the material.
    • The findings highlight the crucial role of atomic disorder in shaping vortex matter behavior in superconductors.