We report on the observation of highly anisotropic viscous electronic conducting phase in amorphous WO1.55 films that occurs below a current (I)- and frequency (f)- dependent temperature T*(I, f). At T < T*(I, f) the rotational symmetry of randomly disordered electronic background is broken leading to the appearance of mutually perpendicular metallic- and insulating-like states. A rich dynamic behavior of the electronic matter occurring at T < T*(I, f) provides evidence for an interplay between pinning effects and electron-electron interactions. The results strongly suggest a dynamic crystallization of the disordered electronic matter, viz. formation of sliding Wigner crystal, as well as the occurrence of quantum smectic or stripe phase in the pinning-dominated regime.
@article{arxiv.cond-mat/0701240,
title = {Charge Ordering in Amorphous WO$_{x}$ Films},
author = {Yakov Kopelevich and Robson R. da Silva and Aline Rougier and Igor A. Lukyanchuk},
journal= {arXiv preprint arXiv:cond-mat/0701240},
year = {2009}
}