Abstract
The temperature dependence of the quantized voltage steps near the superconducting transition temperature of Nb∕Al–AlOx∕Nb overdamped Josephson junctions irradiated at 75GHz has been studied. These junctions can switch between the hysteretic and nonhysteretic regime either by varying a fabrication parameter or, as shown in the present paper, by changing the junction operating temperature. Due to the high values of JC and VC up to 75kA∕cm2 and 0.5mV at 4.2K, respectively, and to the moderate temperature dependence of these parameters, the height of the first rf-induced step was larger than 1mA at T=6–8K, corresponding to 0.7–0.9T∕TC on a junction of 5×5μm2. The flatness at the nanovolt level of this step demonstrates the feasibility of programable or ac voltage standards operating in a cryocooler setup.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
