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Equilibration and dynamic phase transitions of a driven vortex lattice.
1Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08855, USA.
Physical Review Letters
|October 6, 2000
Summary
Fast transport techniques reveal two current-driven transitions in metastable vortex lattices of 2H-NbSe2. These transitions include equilibration from metastable to stable states and dynamic crystallization at higher currents.
Area of Science:
- Condensed Matter Physics
- Materials Science
Background:
- Vortex lattices in superconductors exhibit complex behaviors.
- Metastable states in vortex lattices are often overlooked in standard transport measurements.
Purpose of the Study:
- To investigate current-driven transitions in metastable vortex lattices.
- To detect and characterize states missed by conventional slow transport methods.
Main Methods:
- Utilized a fast transport technique to probe the vortex lattice of undoped 2H-NbSe2.
- Observed the evolution of metastable states under varying current densities.
Main Results:
- Identified two distinct current-driven transitions in metastable vortex lattices.
- Observed an equilibration transition from metastable to stable states at low currents.
- Detected a dynamic crystallization transition at high currents.
Conclusions:
- Fast transport measurements are crucial for observing transient phenomena in vortex lattices.
- Metastable states play a significant role in the dynamic response of vortex matter.