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Microwave resonant activation in hybrid single-gap/two-gap Josephson tunnel junctions
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Although these junctions are relatively large, junctions of similar size fabricated in the same way exhibited good uniformity of the barrier.19
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here combines the effect of the quasiparticle tunneling (the “sub-gap” resistance, from the slope of the curve for ) together with the circuit in which the junction is embedded.4,27
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Microwave resonant activation is a powerful, straightforward technique to study classical and quantum systems, experimentally realized in Josephson junction
devices cooled to very low temperatures. These devices typically consist of two single-gap superconductors separated by a weak link. We report the results of the first resonant activation experiments on hybrid thin film Josephson junctions consisting of a multi-gap superconductor (MgB2) and a single-gap superconductor (Pb or Sn). We can interpret the plasma frequency in terms of theories both for conventional and hybrid
junctions. Using these models, we determine the junction parameters including critical current,
resistance, and capacitance and find moderately high quality factors of 100 for these junctions.
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