Influence of Quantum Hall Effect on Linear and Nonlinear Conductivity in   the FISDW States of the Organic Conductor (TMTSF)_2PF_6
  We report a detailed characterization of quantum Hall effect (QHE) influence on the linear and non-linear resistivity tensor in FISDW phases of the organic conductor (TMTSF)2PF6. We show that the behavior at low electric fields, observed for nominally pure single crystals with different values of the resistivity ratio, is fully consistent with a theoretical model, which takes QHE nature of FISDW and residual quasi-particle density associated with different crystal imperfection levels into account. The non-linearity in longitudinal and diagonal resistivity tensor components observed at large electric fields reconciles preceding contradictory results. Our theoretical model offers a qualitatively good explanation of the observed features if a sliding of the density wave with the concomitant destruction of QHE, switched on above a finite electric field, is taken into account. 
T. Vuletic, C. Pasquier, P. Auban-Senzier, S. Tomic, D. Jerome, K.   Maki, and K. Bechgaard