Mode locking of vortex matter driven through mesoscopic channels

Details Mode locking of vortex matter driven through mesoscopic channels Mode locking of vortex matter driven through mesoscopic channels

2002-03-18

arxiv.org/abs/cond-mat/0203352v2

Physics

Condensed Matter

Superconductivity

some minor changes were made, 4 pages, 4 figures, accepted for publication in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.88.247004

We investigated the driven dynamics of vortices confined to mesoscopic flow channels by means of a dc-rf interference technique. The observed mode-locking steps in the $IV$-curves provide detailed information on how the number of rows and lattice structure in the channel change with magnetic field. Minima in flow stress occur when an integer number of rows is moving coherently, while maxima appear when incoherent motion of mixed $n$ and $n\pm 1$ row configurations is predominant. Simulations show that the enhanced pinning at mismatch originates from quasi-static fault zones with misoriented edge dislocations induced by disorder in the channel edges.

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