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Depinning of a metastable disordered vortex lattice
1Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08855, USA.
Physical Review Letters
|April 6, 2001
Summary
The depinning of vortex lattices in 2H-NbSe2 begins below critical current via channel formation. Mobile vortex channels dictate the depinning dynamics and critical current behavior.
Area of Science:
- Condensed Matter Physics
- Materials Science
Background:
- Vortex lattices in superconductors exhibit complex depinning dynamics.
- Understanding depinning is crucial for superconducting device applications.
Purpose of the Study:
- Investigate the depinning dynamics of a strongly pinned vortex lattice in 2H-NbSe2.
- Characterize the mechanism and kinetics of vortex lattice depinning.
Main Methods:
- Experimental investigation of depinning dynamics.
- Monitoring delayed voltage response to current steps.
- Measuring critical current dependence on ramping rate.
Main Results:
- Depinning initiates at currents significantly below the critical current of the entire lattice.
- Depinning is governed by the formation of mobile vortex channels connecting sample edges.
- Channel formation time and subsequent vortex motion kinetics were quantified.
Conclusions:
- The study reveals a novel, multi-stage depinning mechanism in 2H-NbSe2.
- Channel formation is a key precursor to bulk vortex lattice depinning.
- Results provide insights into vortex dynamics and critical current limitations.