Abstract

The microwave-induced constant voltage steps in the current-voltage characteristics of dc SQUIDs and their dependence on the external magnetic flux are investigated in the frame of the first harmonic approximation. The synchronized Josephson oscillations of a microwave driven dc SQUID show period doubling instabilities for fixed SQUID parameter regions. The effect of such an instability on the constant voltage steps and criterions to avoid period doubling are discussed in the case of zero external flux.

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