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We have investigated a small-area Josephson tunnel junction in a superconducting quantum interference device (SQUID) geometry, biased through high-resistance thin-film leads. This configuration provides the necessary conditions for the observation of charging effects. The Josephson coupling energy EJ was varied by an external magnetic flux introduced into a SQUID loop. The current-voltage characteristics of the system were measured at low temperatures T{~}80 mK and different values of EJ. At a certain value of the current the Zener tunneling rate exceeds that of the dissipative relaxation and the system ``jumps'' from the lowest to higher Brillouin zones. This corresponds to a crossover on the I-V curve. The crossover current Icr was measured as a function of EJ. Good agreement between our data and a theory of Zener tunneling with dissipation has been found. {} 1996 The American Physical Society.
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Kuzmin et al. (1996) studied this question.
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