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Overdamped Josephson Junctions for Applications to precision measurement

机译：用于应用精确测量的覆盖约瑟夫森结

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Overdamped Nb/Al-AlOx/Nb Josephson junctions are an intermediate state between the SIS and SNS Josephson junctions. With a proper choice of the fabrication parameters, stable and reproducible nonhysteretic current-voltage characteristics have been obtained Featuring critical current densities up to 70 kA/cm{sup}2 and characteristic voltages up to 450 μV at 4.2 K, overdamped junctions are suitable for many applications ranging from RSFQ electronic circuits to programmable and ac voltage standards. Tests on single junctions and arrays of series-connected junctions have shown a suitable behaviour when driven by a microwave with frequencies around 75 GHz. The quantized steps have proven to be stable and flat at nV level. These junctions have also shown an improved temperature dependence, which can be interesting in view of the development instrumentation with an integrated quantum voltage reference operated in a closed cycle refrigerator.
机译：过度调节的Nb / Al-Alox / NB Josephson结是SIS和SNS Josephson结之间的中间状态。 With a proper choice of the fabrication parameters, stable and reproducible nonhysteretic current-voltage characteristics have been obtained Featuring critical current densities up to 70 kA/cm{sup}2 and characteristic voltages up to 450 μV at 4.2 K, overdamped junctions are suitable for许多应用范围从RSFQ电子电路到可编程和交流电压标准。当通过75GHz左右的微波驱动时，对单一结和串联连接的阵列的测试表明了适当的行为。已经证明量化步骤在NV水平下稳定且平坦。这些交界处还示出了改善的温度依赖性，这考虑到具有在闭合循环冰箱中操作的集成量子电压参考的开发仪器，这可能是有趣的。

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