  Nonlocal supercurrent was observed in mesoscopic planar SNS Josephson
junction with additional normal metal electrodes when nonequilibrium
quasiparticles were injected from the normal metal electrode in one of the
superconducting banks of the Josephson junction in the absence of net transport
current through the junction. We claim that the effect observed is due to a
supercurrent counterflow appearing to compensate the quasiparticle flow in the
SNS weak link. We have measured SNS junction response for different distances
from the quasiparticle injector to the SNS junction at temperatures far below
the superconducting transition temperature. The charge-imbalance relaxation
length was estimated by using modified Kadin, Smith and Skocpol scheme in the
case of planar geometry. The model developed allows to describe the interplay
of the charge imbalance and Josephson effects in the nanoscale proximity system
in detail.
