DPG Phi
Verhandlungen
Verhandlungen
DPG

Berlin 2005 – scientific programme

Parts | Days | Selection | Search | Downloads | Help

TT: Tiefe Temperaturen

TT 10: Superconductivity - Tunneling, Josephson Junctions, SQUIDs

TT 10.3: Talk

Saturday, March 5, 2005, 09:00–09:15, TU H104

Thermally induced injection of vortices in narrow long Josephson junctions — •Abdufarrukh A. Abdumalikov1, Mikhail V. Fistul2, and Alexey. V. Ustinov11Physikalisches Institut III, Universität Erlangen-Nürnberg, D-91058 Erlangen — 2Theoretische Physik III, Ruhr-Universität Bochum, D-44801 Bochum

We report an experimental and theoretical study of a novel resistive state in ultra-narrow long Josephson junctions induced by thermal fluctuations. In the presence of an externally applied magnetic field, the hysteretic current-voltage characteristics show a low-voltage branch emerging directly from the superconducting state. We explain this feature by random injection of vortices into the junction in the presence of a large high-frequency damping. We obtain the current-voltage characteristics by calculating the dc bias dependent activation rate of the vortex injection. This activation rate is determined by a surface barrier that is controlled by an external magnetic field. Our theoretical analysis, taking into account thermally induced injection of vortices, quantitatively agrees with experimental results.

100% | Mobile Layout | Deutsche Version | Contact/Imprint/Privacy
DPG-Physik > DPG-Verhandlungen > 2005 > Berlin