Abstract
Current-voltage (I–V) characteristics and millimeter-wave detection were investigated at 70K concerning the step-edge microbridge Josephson junction (SEJJ) fabricated by YBaCuO thin film. By the use of dry-etching method at the step-edge formation, a smooth etched surface was obtained and superconductor thin film could be deposited on the etched surface whose properties were comparable to that on the original surface. The I–V characteristics could be described by the resistively shunted junction (RSJ) model up to 70K. The critical current (Ic) and normal resistance (R) were 100 LIA and 1.5Ω, respectively (IcR=150µV). Video detection of 110GHz millimeter-wave signal was successfully achieved. The responsivity (Rv) and noise equivalent input power (NEP) were calculated as 2.4×103VW and \(2.9{\text{x1}}{{\text{0}}^{ - 14}}{\text{W/}}\sqrt {{\text{Hz}}}\), respectively, using the RSJ model approximation.
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