Direct observation of charge density wave current conversion by spatially resolved synchrotron x-ray studies in NbSe3

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 NbSe3 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 g 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.