Dresden 2006 – scientific programme

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TT: Tiefe Temperaturen

TT 1: Superconductivity: Tunnelling, Josephson Junctions, SQUIDs

TT 1.7: Talk

Monday, March 27, 2006, 11:00–11:15, HSZ 02

Decay of metastable states in annular Josephson junctions in the presence of external magnetic field — •Abdufarrukh A. Abdumalikov, Astria Price, Alexander Kemp, and Alexey V. Ustinov — Physikalisches Institut III, UniversitätErlangen-Nürnberg, Erlangen, Germany

We investigate numerically and experimentally thermal activation processes in annular Josephson junctions of different length L. Junctions with and without a trapped vortex are studied. The numerical analysis is performed using the perturbed sine-Gordon model with a thermal noise term. For long junctions (L∼10λ_J), the dependence of the switching current histogram width on the magnetic field agrees with the theoretical analysis of Refs. [1,2] based on the collective coordinate approach. For shorter junctions we find deviations from the prediction of this analysis. Experimental results and numerical simulations show fairly good agreement.

[1] M. Fistul et al., Physica B 284-288, 585 (2000)

[2] M. Fistul et al., Phys. Rev. Lett. 91, 257004 (2003)