Charge Ordering in Amorphous WO$_{x}$ Films

Details Charge Ordering in Amorphous WO$_{x}$ Films Charge Ordering in Amorphous WO$_{x}$ Films

2007-01-11

arxiv.org/abs/cond-mat/0701240v1

Physics

Condensed Matter

Strongly Correlated Electrons

17 pages including 5 figures

Scientific paper

10.1016/j.physb.2007.10.113

We report on the observation of highly anisotropic viscous electronic conducting phase in amorphous WO$_{1.55}$ 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.

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