Abstract
The flexibility of step edge junctions is very attractive for device applications. With an improved process based on an amorphous carbon mask technique and electron beam lithography, we were able to fabricate high quality YBa2Cu307 long Josephson junctions across sharp and straight step edges on (001) LaAl03 substrates. Flux-flow resonances were observed in the current-voltage curves for some long Josephson junctions. The resonance voltage can linearly be tuned by an applied magnetic field. Asymmetric in-line type Josephson flux-flow transistors were fabricated based on the long Josephson junctions. The critical current Ic, and the response voltage V at a fixed bias current Ib, were measured as a function of the control current I<sub<cr through a control line inductively coupled to the junction. A maximum current gain of g=17, and a corresponding transresistance of rm=9 Ω, were achieved at 4.2 K.
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