Influence of FISDW depinning on the quantized hall effect in (TMTSF)/Sub 2/pf/Sub 6/

Summary form only given. The Hall resistance as a function of the current along the conducting chains is investigated in the magnetic-field-induced spin-density wave (FISDW) phases of (TMTSF)/sub 2/PF/sub 6/, (TMTSF stands for tetramethyltetraselenafulvalene). Recently, we have reported/sub 1/ a nonlinear Hall resistance decreasing strongly with increasing current above a well-defined threshold current. Now we present strong evidence that the nonlinearity arises from the depinning of the FISDW. We show that by applying a radio-frequency excitation superimposed on a dc bias, interference features appear in the differential Hall resistance whwnever the phase change rate of the sliding FISDW is equal to the frequency of the rf excitation (Shapiro interference).