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

✍ Scribed by M.J.M.E. de Nivelle; G.J. Gerritsma; H. Rogalla

• Publisher: Elsevier Science
• Year: 1994
• Tongue: English
• Weight: 956 KB
• Volume: 233
• Category: Article
• ISSN: 0921-4534
• DOI: 10.1016/0921-4534(94)00596-6

✦ Synopsis

Nanobridges with widths down to 140 nm and lengths of about 250 nm were structured in a 25 nm YBa2CuaOT_a 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 describes 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 ~/is approximately I. 0 × 10-to kg/ms and the penetration depth is approximately 4 ttm. These values indicate that the transport properties are dominated by the weak-link behaviour of grain boundaries or twin boundaries in the thin film.