The role of splayed disorder and channel flow on the dynamics of driven 3D vortices

Abstract

We present the results of three-dimensional molecular dynamics simulations of vortices which indicate that, for B larger than the matching field, the enhanced pinning effectiveness of splayed columnar defects relative to vertical columnar defects can be explained in terms of the existence or absence of channels through which the vortices can flow without encountering defects.

Elastic lines on splayed columnar defects studied numerically

“…On the other hand the comparison of samples with one and two families of splay defects did not reveal any differences in the values of j c [7]. Molecular dynamics simulations for B > B φ show the increase of j c in the samples with splay disorder [8,9]. The authors of [9] have also performed simulations on samples with B < B φ for which they obtained a milder enhancement of j c .…”