J. Phys. IV France 09 (1999) Pr10-113-Pr10-115
Commensurate-incommensurate transitions in ordered and disordered vortex flow channelsR. Besseling1, T. Dröse2, R. Niggebrugge1 and P.H. Kes1
1 Kamerlingh Onnes Laboratorium, Leiden University, P.O. Box 9504, 2300 RA Leiden, The Netherlands
2 I. Institut für Theoretische Physik, Universität Hamburg, Jungiusstrasse 9, 20355 Hamburg, Germany
A numerical and analytical study of vortex flow behavior in weak pinning channels has revealed that, for a channel in a perfect lattice, incommensurability between channel width and the vortex lattice constant causes (point) defects in the channel with a nearly vanishing barrier Jc. The transport characteristics exhibit a crossover from low mobility (defect motion) to full flux flow (coherent motion). Jc versus commensurability parameter is a discontinuous function with sharp peaks at integer values. Disorder in the channel edges smears the sharp C-I transitions due to defect pinning at Incommensurability. Also it lowers the Commensurate Jc due to defect generation. These observations agree with experiments we perfomed on weak pinning vortex channels in strong pinning films.
© EDP Sciences 1999