Change search
ReferencesLink to record
Permanent link

Direct link
Low-field vortex dynamics in various high-T-c thin films
2002 (English)In: Pramana (Bangalore), ISSN 0304-4289, E-ISSN 0973-7111, Vol. 58, no 06-maj, 985-993 p.Article in journal (Refereed) Published
Abstract [en]

We present a novel ac susceptibility technique for the study of vortex creep in superconducting thin films. With this technique we study the dynamics of dilute vortices in c-axis oriented Y-123, Hg-1212, and TI-1212 thin films, as well as a-axis oriented Hg-1212 thin films. Results on the Hg-1212 and Tl-1212 thin films indicate that dislocation-mediated plastic flux creep of single vortices dominates at low temperatures and fields. As the temperature (or the field) is increased, the increasing vortex-vortex interactions promote a collective behavior, which can be characterized by elastic creep with a non-zero It exponent. Also, in some of these samples effects of thermally assisted quantum creep are visible up to 45 K in some of these samples. In Y-123 thin films, creep is found to be collective down to the lowest temperatures and fields investigated, while the quantum creep persists only up to 10-11 K.

Place, publisher, year, edition, pages
2002. Vol. 58, no 06-maj, 985-993 p.
Keyword [en]
vortex dynamics, flux creep, high temperature superconductor, thin film, ac susceptibility, flux-creep, ii superconductors, critical currents, single-crystal, magnetic-field, temperature, transition, lattice, hgba2cacu2o6+delta, susceptibility
URN: urn:nbn:se:kth:diva-24035ISI: 000176937700046OAI: diva2:342793
QC 20100525Available from: 2010-08-11 Created: 2010-08-11Bibliographically approved

Open Access in DiVA

No full text

Search in DiVA

By author/editor
Åkerman, Johan
In the same journal
Pramana (Bangalore)

Search outside of DiVA

GoogleGoogle Scholar
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Total: 15 hits
ReferencesLink to record
Permanent link

Direct link