Static and dynamic properties of the SDW in (TMTSF)(2)X

The static and dynamic properties of incommensurate SDW phase in (TMTSF)(2) PF6 were investigated by the NMR and non-linear conductivity measurements. The temperature dependence of 1 indicates the sub-phase transition in the S DW phase. In the low temperature SDW sub-phase, the non-linear conductivity , associated with the sliding motion of the SDW, is observed with a clear t hreshold field. In addition, the temperature independent non-linear conduct ivity appears for a higher electric field and its field dependence suggests the quantum origin. These behaviours are discussed in the viewpoint of the SDW with the discommensuration.