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We report on Pb/Bi/In-oxide-Pb/Bi sandwich films which appear to be particularly suitable for quasiparticle heterodyne mixers and video detectors. This junction shows good stability under thermal cycling; its gap voltage is 0.4–0.5 mV higher and the nonlinearity of the I-V curve is stronger than the recently successfully used Pb/In/(Au)-oxide-Pb/Bi junction. Critical current densities up to 1600 A/cm2 have been obtained so far.
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Gundlach et al. (1982) studied this question.
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