Control of the Josephson Current Density of Edge Junctions
Original Publication Date: 1980-Dec-01
Included in the Prior Art Database: 2005-Feb-13
Nb - Nb(2)O(5) - Pb Josephson tunnel junctions in which the oxide barrier is formed in a low-pressure Ar + O plasma (3 m torr) exhibit a Josephson current density j which is much higher at the edges of the Nb base electrode than on the surface, i.e., j shows a strong angular dependence. This adverse influence on the reproducibility of j can be reduced by increasing the pressure of the plasma and/or by using pure O(2) instead of the Ar + O(2) mixture.