Crossover from Kramers to phase-diffusion switching in moderately damped Josephson junctions

J. Männik; S. Li; W. Qiu; W. Chen; V. Patel; S. Han; J. E. Lukens

doi:10.1103/PhysRevB.71.220509

← Back to search

Crossover from Kramers to phase-diffusion switching in moderately damped Josephson junctions

J. Männik, S. Li, W. Qiu, W. Chen, V. Patel, S. Han, J. E. Lukens

DOI 10.1103/PhysRevB.71.220509 · Physical Review B

T1

Active bibliographic source — not scientific approval

Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.

Abstract

We have measured and propose a model for switching rates in a hysteretic dc superconducting quantum interference device (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 the 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 temperatures where the peaks occur are proportional to the critical current of the dc SQUID.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Nb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown