M. Machida et H. Kaburaki, DIRECT NUMERICAL EXPERIMENT ON 2-DIMENSIONAL PINNING DYNAMICS OF A 3-DIMENSIONAL VORTEX LINE IN LAYERED SUPERCONDUCTORS, Physical review letters, 75(17), 1995, pp. 3178-3181
We clarify structures and dynamics of tilted vortices in the T-c modul
ated three-dimensional (3D) layered superconductor by performing a dir
ect numerical simulation of the time-dependent Ginzburg-Landau equatio
n coupled with Maxwell's equation. The change of vortex dynamics from
a rigid and straight vortex line in the low temperature region to a st
epwise vortex in the high temperature region is observed. We investiga
te vortex pinning for columnar and point defects, and find that a flex
ible deformation of vortex segments parallel to the layer in the 3D co
ntinuous stepwise vortex is reinforced in the presence of pinning cent
ers and leads to 2D pinning dynamics. Also, this increased flexibility
is shown to bring about more effective vortex pinning.