Static and dynamic coupling transitions of vortex lattices in disordered anisotropic superconductors.
We use three-dimensional molecular dynamics simulations of magnetically interacting pancake vortices to study vortex matter in disordered, highly anisotropic materials such as BSCCO. We observe a sharp 3D-2D transition from vortex lines to decoupled pancakes as a function of relative interlayer coupling strength, with an accompanying large increase in the critical current reminiscent of a second peak effect. We find that decoupled pancakes, when driven, simultaneously recouple and order into a crystalline-like state at high drives. We construct a dynamic phase diagram and show that the dynamic recoupling transition is associated with a double peak in dV/dI.
Olson
C J
CJ
Department of Physics, University of California, Davis, California 95616, USA.
Zimányi
G T
GT
Kolton
A B
AB
Grønbech-Jensen
N
N