We report the observation of chaotic noise in Josephson tunnel junctions in the presence of a dc current and irradiated with microwave radiation. Four different chaotic phenomena have been measured associated to either anomalies in the I-V characteristics and/or high noise temperatures, with chaotic noise temperatures as high as 10⁶ K. A new chaotic mode is reported consisting of a recurrent smoothing of large sections of the I-V characteristic for certain values of microwave power. The resistively shunted junction model is shown to contain most of the observed phenomena.
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Octavio et al. (1984) studied this question.
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