Physics – Condensed Matter – Superconductivity
Scientific paper
1996-02-14
Phys. Rev. B 53 (1996) R8898-R8901
Physics
Condensed Matter
Superconductivity
4 pages, 4 PostScript Figures
Scientific paper
10.1103/PhysRevB.53.R8898
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 $B_{\phi}$. 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 $B_{\phi}$, 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_{\phi} $.
Field Stuart
Groth J.
Nori Franco
Olson Cynthia J.
Reichhardt Charles
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