Transport measurements on ultra-thin CaBaCuO films

TitleTransport measurements on ultra-thin CaBaCuO films
Publication TypeJournal Article
Year of Publication2007
AuthorsBorn D, Stornaiuolo D, Tafuri F, Kirtley JR, Kogan VG, Medaglia PG, Orgiani P, Balestrino G, Bauch T, Lombardi F
Journal TitlePhysica C-Superconductivity and Its Applications
Date PublishedSep
Type of ArticleProceedings Paper
ISBN Number0921-4534
Accession NumberISI:000249870600062
KeywordsDISSIPATION, HTS, PEARL VORTICES, Perl vortex dynamics, systems, thin film, vortex quantum tunnelling

We investigated transport properties of ultra-thin CaBaCuO (CBCO) films, focusing on vortex dynamics. By measuring current-voltage characteristics we found evidence that at high temperatures the vortices are thermally activated at the edges of the bridge and pushed in, causing dissipation and power-law dependence of the voltage from the current. At lower temperatures, the experimental curves change shape. We compared these data with the predicted behaviour for vortex quantum tunnelling and found a very good agreement. Measurements performed at ultra-low temperatures (down to 60 mK) in a particular low noise environment provide additional evidence of the robustness of the observed effects. (c) 2007 Elsevier B.V. All rights reserved.

Alternate JournalPhysica C