Direct current heating in superconductor-insulator-superconductor tunnel devices for THz mixing applications

P. Dieleman, T.M. Klapwijk, S. Kovtonyuk, H. van de Stadt

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    DC heating effects in superconductor-insulator-superconductor (SIS) tunnel junctions are studied by comparing junctions sandwiched between niobium or aluminum layers. With niobium a temperature rise of several Kelvin is observed, which is reduced by an order of magnitude by using aluminum. A simple model satisfactorily explains this observation and predicts a 30% increase in the subgap current due to the elevated temperature. At the operating voltage for heterodyne mixing the receiver noise temperature increases by only 2%. (C) 1996 American Institute of Physics.
    Original languageEnglish
    Pages (from-to)418-420
    Number of pages3
    JournalApplied Physics Letters
    Issue number3
    Publication statusPublished - 15-Jul-1996


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