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Driven dynamics of the vortex-phase mixture near the peak effect: the "vortex capacitor"
M Marchevsky1, M J Higgins, S Bhattacharya
1NEC Research Institute, 4 Independence Way, Princeton, New Jersey 08540, USA.
Physical Review Letters
|February 28, 2002
Summary
A new model explains anomalous vortex dynamics in superconductors by considering two vortex phases. Real-space visualization confirms this "contamination" and "annealing" scenario in NbSe2, advancing superconductor research.
Area of Science:
- Condensed Matter Physics
- Superconductivity Research
- Vortex Dynamics
Background:
- Superconductors exhibit complex vortex matter behavior, particularly near the peak effect.
- Anomalous dynamic effects like "contamination" and "annealing" are widely reported but lack a unified explanation.
Purpose of the Study:
- To propose a phenomenological model for vortex dynamics incorporating two coexisting vortex phases.
- To quantitatively describe anomalous dynamic effects in superconductors.
- To provide the first real-space visualization of vortex pinning in a driven vortex lattice.
Main Methods:
- Development of a phenomenological model for vortex dynamics.
- Application of scanning ac Hall microscopy.
- Experimental investigation of the superconductor NbSe2.
Main Results:
- The proposed model quantitatively describes anomalous vortex dynamics, including "contamination" and "annealing" effects.
- Real-space visualization of vortex pinning in the driven vortex lattice of NbSe2 was achieved.
- Experimental results are consistent with the proposed two-phase vortex matter scenario.
Conclusions:
- The coexistence of two vortex phases with different critical current densities explains anomalous vortex dynamics.
- Scanning ac Hall microscopy provides crucial insights into vortex pinning mechanisms.
- The findings validate the proposed model and enhance understanding of superconductor behavior near the peak effect.