Volume 62, Number 3, May 2003
|Page(s)||419 - 425|
|Section||Condensed matter: electronic structure, electrical, magnetic, and optical properties|
|Published online||01 April 2003|
Depinning of a vortex chain in a disordered flow channel
Kamerlingh Onnes Laboratorium, Leiden
University P.O. Box 9504, 2300 RA Leiden, the Netherlands
2 I. Institut für Theoretische Physik, Universität Hamburg Jungiusstrasse 9, D-20355 Hamburg, Germany
3 Materials Science Division, Argonne National Laboratory Argonne, IL 60439, USA
Accepted: 27 February 2003
We study depinning of vortex chains in channels formed by static, disordered vortex arrays. Depinning is governed either by the barrier for defect nucleation or for defect motion, depending on whether the chain periodicity is commensurate or incommensurate with the surrounding arrays. We analyze the reduction of the gap between these barriers as a function of disorder. At large disorder, commensurability becomes irrelevant and the pinning force is reduced to a small fraction of the ideal shear strength of ordered channels. Implications for experiments on channel devices are discussed.
PACS: 74.60.Ge – Flux pinning, flux creep, and flux-line lattice dynamics / 71.45.Lr – Charge-density-wave systems / 83.50.Lh – Slip boundary effects (interfacial and free surface flows)
© EDP Sciences, 2003
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