We present results on the normal-collective current conversion processes and associated deformation profile for a charge density wave in the sliding state. High resolution x-ray measurements of the satellite positional shift have been performed on ${\mathrm{NbSe}}_3$ at 90 K. The shift $q$ has been determined in the vicinity of the contacts by applying direct currents. We observe a steep variation of $q$ near the contact, modeled in terms of dislocation loops (DL) nucleated at host defects. A small constant gradient in the sample's central part indicates incomplete conversion, consistent with DL pinning.

• Received 18 February 1998

DOI:https://doi.org/10.1103/PhysRevLett.80.5631