Crossover from Kramers to phase-diffusion switching in hysteretic DC-SQUIDs

Details Crossover from Kramers to phase-diffusion switching in hysteretic DC-SQUIDs Crossover from Kramers to phase-diffusion switching in hysteretic DC-SQUIDs

2005-03-31

arxiv.org/abs/cond-mat/0503729v1

Phys. Rev. B 71, 220509 (2005)

Physics

Condensed Matter

Superconductivity

4 pages, 4 figures

Scientific paper

10.1103/PhysRevB.71.220509

We have measured and propose a model for switching rates in hysteretic DC-SQUID in the regime where phase diffusion processes start to occur. We show that the switching rates in this regime are smaller than the rates given by Kramers' formula due to retrapping of Josephson phase. The retrapping process, which is affected by the frequency dependent impedance of the environment of the DC-SQUID, leads to a peaked second moment of the switching distribution as a function of temperature. The temperature where the peaks occur are proportional to the critical current of the DC- SQUID.

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