Unidirectional charge-density-wave sliding in two-dimensional rare-earth tritellurides

Nonlinear transport properties in the layered TbTe3 and GdTe3 rare-earth tritellurides with a charge- density-wave( CDW) transition above room temperature have been studied along different crystal- lographic orientations.The pronounced effect of collective CDW motion is observed along c-axis andi s absent completely in the perpendicular direction demonstrating the unidirectional character of the CDW.In contrast to one-dimensiona lCDWs the threshold electric field for CDW sliding is linearly temperature dependent in a wide range of temperature