Possible physical mechanisms of stochastic oscillations in rf SQUID’s
I. M. DmitrenkoPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, KharkovD. A. KonotopPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, KharkovG. M. TsoĭPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, KharkovV. I. ShnyrkovPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, Kharkov
ABI
Abstract
The processes of giant noise generation in rf SQUID’s are studied experimentally. It is shown that the appearance of stochastic oscillations is due to different retardation mechanisms in a dynamic system, depending on the characteristics of the Josephson junctions and the external excitation. The retardation times in the SQUID’s studied were determined by the recharging of the Josephson-junction capacitance (τRC), by quasiparticle relaxation processes (τε), and by the relaxation time of thermal processes in the junction (τT).
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