Vortex Plastic Flow, B(x,y,H(t)),M(H(t)), J c (B(t)) , Deep in the Bose Glass and Mott-Insulator Regimes
C. Reichhardt, C. J. Olson, J. Groth, Stuart Field, Franco Nori
Abstract
We present simulations of flux-gradient-driven superconducting vortices interacting with strong columnar pinning defects as an external field
H(t)
is quasi-statically swept from zero through a matching field
B
ϕ
. We analyze several measurable quantities, including the local flux density
B(x,y,H(t))
, magnetization
M(H(t))
, critical current
J
c
(B(t))
, and the individual vortex flow paths. We find a significant change in the behavior of these quantities as the local flux density crosses
B
ϕ
, and quantify it for many microscopic pinning parameters. Further, we find that for a given pin density
J
c
(B)
can be enhanced by maximizing the distance between the pins for
B<
B
ϕ
.