Preparation of superconducting weak links in molybdenum films by ion implantation

We Have Implanted Patterns of N+ and/or S+ ions into Mo films so as to produce structures in which two heavily-doped Mo regions with relatively high transition temperature Tc are connected by a short (∼ lμm) lightly-doped Mo region with lower transition temperature Tc’. Near Tc’ the lightly-doped region acts as a weak link between the heavily doped regions and passes a supercurrent having an oscillatory “diffraction pattern” dependence on magnetic field similar to that of Josephson tunnel junctions. Copyright © 1975 by The Institute of Electrical and Electronics Engineers, Inc.