Effect of dimensionality on sliding charge density waves. The case of   the quasi-two dimensional TbTe$_3$ system probed by coherent x-ray   diffraction
  We report on sliding Charge Density Wave (CDW) in the quasi two-dimensional TbTe$_3$ system probed by coherent x-ray diffraction combined with {\it in-situ} transport measurements. We show that the non-Ohmic conductivity in TbTe$_3$ is made possible thanks to a strong distortion of the CDW. Our diffraction experiment versus current shows first that the CDW remains undeformed below the threshold current I$_S$ and then suddenly rotates and reorders by motion above threshold. Contrary to quasi-one dimensional systems, the CDW in TbTe$_3$ does not display any phase shifts below I$_S$ and tolerates only slow spatial variations of the phase above. This is a first observation of CDW behavior in the bulk in a quasi-two dimensional system allowing collective transport of charges at room temperature. 
D. Le Bolloc'h, A.A. Sinchenko, V.L.R. Jacques, L. Ortega, J.E.   Lorenzo, G. Chahine, . Lejay, and P. Monceau
cond-mat.str-el