Charge ordering in amorphous WO x films
Abstract
We observed 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 suggest a dynamic crystallization of the disordered electronic matter, viz. formation of sliding Wigner crystal, as well as the occurrence of quantum liquid-like crystal or stripe phase at low drives.
- Publication:
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Physica B Condensed Matter
- Pub Date:
- April 2008
- DOI:
- 10.1016/j.physb.2007.10.113
- arXiv:
- arXiv:cond-mat/0701240
- Bibcode:
- 2008PhyB..403.1211K
- Keywords:
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- Condensed Matter - Strongly Correlated Electrons;
- Condensed Matter - Superconductivity
- E-Print:
- 17 pages including 5 figures