Electrical transport in the spin-density-wave phase of (TMTSF-d12)2ClO4

We have investigated the electrical transport properties in both (TMTSF)2ClO4 and deuterated (TMTSF-d12)2ClO4. In (TMTSF-d12)2ClO4, we observed the anion ordering at TAO=27 K with a resistance drop as well as (TMTSF)2ClO4, where TAO=24 K. When the sample is quenched rapidly, the highest TSDW is obtained as 6 and 5 K in (TMTSF)2ClO4 and (TMTSF-d12)2ClO4, respectively. This difference indicates that the two-dimensionality of the electronic band in (TMTSF-d12)2ClO4 is stronger than that in (TMTSF)2ClO4. We also observed the non-linear electric conductivity with the threshold electric field ET associated with the sliding of spin-density-wave (SDW) in (TMTSF-d12)2ClO4. The value of ET sharply increases with decreasing temperature just below TSDW and becomes almost constant around 0.6TSDW. In addition, ET shows another increase below 0.4TSDW. In (TMTSF)2ClO4, ET is monotonically decreases with decreasing temperature and the temperature dependence becomes weaker as TSDW decreases. These behaviors are attributed to the difference of the mechanism of SDW sliding between two compounds.