Nature of critical current and coherent phenomena in granular MoNx thin films

Investigations of the critical current versus temperature and applied magne tic field are carried out for granular MoNx films. All samples display a tw o-stage superconducting transition and can be treated as a percolating netw ork of SNS contacts with a Josephson coupling between grains. The temperatu re behavior of the critical current for the films studies is the same as th e I-c(T) dependence for a SNS junction in the diffusive limit. The value of critical current in a magnetic field is governed by the pinning of Josephs on vortices. (C) 2000 American Institute of Physics. [S1063-777X(00)00312-1 ].