Coherent vortex motion in YBa2CuO7-delta nanobridges prepared by a substrate-etching technique

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Nivelle de, M.J.M.E. and Gerritsma, G.J. and Rogalla, H. (1994) Coherent vortex motion in YBa2CuO7-delta nanobridges prepared by a substrate-etching technique. Physica C: Superconductivity, 233 (1-2). pp. 185-194. ISSN 0921-4534

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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.
Item Type:Article
Copyright:© 1994 Elsevier Science
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Science and Technology (TNW)
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Link to this item:http://purl.utwente.nl/publications/23770
Official URL:http://dx.doi.org/10.1016/0921-4534(94)00596-6
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Metis ID: 128569