JOSEPHSON-CURRENT FLUCTUATIONS IN DIRTY SNS JUNCTIONS

Sample-to-sample fluctuations of the Josephson current in superconduct or-dirty normal metal-superconductor junctions are studied numerically using a tight-binding model. Particular attention is given to the cas es where the correlation energy of the normal metal is smaller than th e superconducting pair potential. It is found that the amplitude of th e critical-current fluctuation is of order of the correlation energy. This result is in qualitative agreement with the theory of Al'tshuler and Spivak.