Spatio-temporal dynamics and plastic flow of vortices in superconductors with periodic arrays of pinning sites

Details Spatio-temporal dynamics and plastic flow of vortices in superconductors with periodic arrays of pinning sites Spatio-temporal dynamics and plastic flow of vortices in superconductors with periodic arrays of pinning sites

1996-07-24

arxiv.org/abs/supr-con/9607005v1

Phys. Rev. B 54 (1996) 16108-16115

Physics

Condensed Matter

Superconductivity

Scientific paper

10.1103/PhysRevB.54.16108

We present simulations of flux-gradient-driven superconducting rigid vortices interacting with square and triangular arrays of columnar pinning sites in an increasing external magnetic field. These simulations allow us to quantitatively relate spatio-temporal microscopic information of the vortex lattice with typically measured macroscopic quantities, such as the magnetization $M(H)$. The flux lattice does not become completely commensurate with the pinning sites throughout the sample at the magnetization matching peaks, but forms a commensurate lattice in a region close to the edge of the sample. Matching fields related to unstable vortex configurations do not produce peaks in $M(H)$. We observe a variety of evolving complex flux profiles, including flat terraces or plateaus separated by winding current-carrying strings and, near the peaks in $M(H)$, plateaus only in certain regions, which move through the sample as the field increases.

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