Physics – Condensed Matter – Superconductivity
Scientific paper
2009-12-16
Phys. Rev. B Rapid Communications 81, 100506(R) (2010)
Physics
Condensed Matter
Superconductivity
4 pages, 4 postscript figures
Scientific paper
We propose a simple nanostructured pinning array geometry where a rich variety of complex vortex shear banding phenomena can be realized. A single row of pinning sites is removed from a square pinning array. Shear banding effects arise when vortex motion in the pin-free channel nucleates motion of vortices in the surrounding pinned regions, creating discrete steps in the vortex velocity profile away from the channel. Near the global depinning transition, the width of the band of moving vortices undergoes oscillations or fluctuations that can span the entire system. We use simulations to show that these effects should be observable in the transport properties of the system. Similar large oscillations and shear banding effects are known to occur for sheared complex fluids in which different dynamical phases coexist.
Olson Reichhardt C. J.
Reichhardt Charles
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