Microwave resonant activation in hybrid single-gap/two-gap Josephson tunnel junctions

Steven Carabello, Joseph G. Lambert, Jerome Mlack, Wenqing Dai, Qi Li, Ke Chen, Daniel Cunnane, X. X. Xi, Roberto C. Ramos

Research output: Contribution to journalArticlepeer-review


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 Q0∼ 100 for these junctions.

Original languageEnglish (US)
Article number123904
JournalJournal of Applied Physics
Issue number12
StatePublished - Sep 28 2016

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)


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