Coherent vortex motion in YBa2Cu3O7-δ nanobridges prepared by a substrate-etching technique

M.J.M.E. de Nivelle, G.J. Gerritsma, H. Rogalla

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Abstract

Nanobridges with widths down to 140 nm and lengths of about 250 nm were structured in a 25 nm YBa2Cu3O7-δ thin film, by means of a substrate-etching technique. At low temperatures, the current-voltage characteristics of these bridges show clear signs of periodic single-vortex motion. A quantitative comparison could be made with a vortex-flow model, which descirbes the forces acting on the vortices inside a hyperbolically shaped nanobridge, with dimensions much smaller than the thin film magnetic-penetration depth. It follows that the related viscous drag coefficient η is approximately 1.0×10-10kg/ms and the penetration depth is approximately 4 μm. These values indicate that the transport properties are dominated by the weak-link behaviour of grain boundaries or twin boundaries in the thin film.
Original languageEnglish
Pages (from-to)185-194
Number of pages10
JournalPhysica C
Volume233
Issue number1-2
DOIs
Publication statusPublished - 1994

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