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The I-V curves of rf-driven underdamped Josephson junctions have been studied in detail both experimentally and numerically. Very large negatively going tails on top of Shapiro steps in the intermediate-dc-current range and smaller wiggling distortions in the lower-dc-current range are observed for rf frequencies obeying 0.2/RC{}{ω}{}0.4/RC. It is shown that this range is along the low-frequency boundary of the strongly chaotic regime. A physical description is presented to explain successfully the complete I-V curves and the origin of chaos.
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Vanneste et al. (1985) studied this question.
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