Fluctuation effects of I–V characteristics of superconducting Josephson junctions
An analysis is made of the effect of current fluctuations for an rf current-driven Josephson junction in the superconducting regime. The resistively shunted junction model and a transition rate theory between superconducting and dissipative states are used. A new approach is introduced which makes it possible to take into account the fact that, as the applied current amplitude is increased, the number of fluctuation sites increases. The results show that there is an upper cutoff frequency above which fluctuations do not exist. For applied frequencies below the upper cutoff frequency, fluctuations exist over a current range starting from a given current amplitude (which is shown to be frequency-dependent) up to the critical current.
KeywordsMagnetic Material Transition Rate Cutoff Frequency Versus Characteristic Critical Current
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