Parametric amplification on rf-induced steps in a Josephson tunnel junction
O. H. Soerensen, N. F. Pedersen, J. Mygind +1 more
Parametric effects including amplification in a singly degenerate mode have been observed in Josephson tunnel junctions at dc bias points on rf-induced steps. Net gain at 9 GHz was achieved with a bias on the fundamental 18-GHz step and subharmonic self-oscillations were seen on 18 and 70-GHz rf-induced steps even at voltages approaching the energy gap. A qualitative explanation of the results is presented.
Journal of Applied Physics•Apr 1, 1979•6 citations