Abstract
Grain-boundary YBa 2Cu 3O 7− x Josephson junctions were fabricated on (001) NdGaO 3 bicrystal substrates with a misorientation angle of 2×18.4°. Both DC and AC Josephson effects were studied in these high- T c junctions in the range from liquid-helium up to liquid-nitrogen temperatures. The values of characteristic voltages were up to 0.34 mV at a temperature of 10 K. The I-V curves of the junctions and their response to low-intensity millimeter-wave radiation were shown to be described by the RSJ model with thermal fluctuations. Values of responsivity up to 10 6 V/W and a noise equivalent power as low as 10 −14W/ Hz 1 2 were obtained for these junctions operating both in wideband and selective detection modes at a frequency of 78 GHz. The applicability of YBa 2Cu 3O 7− x Josephson junctions made on NdGaO 3 bicrystal substrates for detection and spectral analysis of millimeter-wave and far-infrared radiation is emphasized.
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