Transition from Josephson behavior to depairing behavior in ion-implanted molybdenum weak links

We compare our results for the temperature and bridge-length dependence of the critical supercurrent in ion-implanted molybdenum weak links with a new theory by Likharev and Yakobson. This is the first such comparison to their theory, and quantitative agreement is found. Also, at temperatures for which Likharev and Yakobson predict a sinusoidal current-phase relation, the rf response of our weak links agrees well with shunted junction model computations based on a sinusoidal current-phase relation.