Scaling Between Normal and Spin-Density-Wave Conductivity in (TMTSF) 2 AsF 6

The nonlinear d.c. conduction in the spin-density-wave state of (TMTSF) 2 AsF 6 (TMTSF is tetramethyltetraselenafulvalene) is investigated as a function of temperature (2 to 10 K) and magnetic field (12 T, parallel to the c *-axis). The total nonlinear conductivity follows the variation of the low-field linear conductivity both as a function of temperature and magnetic field in a wide though limited temperature range. The implications on the origin of spin-density-wave damping are discussed.