ANISOTROPIC MAGNETORESISTANCE OF (TMTSF)(2)CLO4 IN THE METALLIC AND SDW STATE

The transverse magnetoresistance (Delta rho/rho) of (TMTSF)(2)ClO4 has been measured at ambient pressure in the temperature range front 0.5K to 4.2K for various cooling rates through the ClO4- anion ordering te mperature (similar to 24K). The transverse magnetoresistance is highly anisotropic for the field orientations in the plane perpendicular to the highly conducting a-axis. Por temperatures below the metal-SDW tra nsition in the quenched state, the magnetoresistance has maximum when the magnetic field is parallel to the lowest conductivity direction c and its value is temperature independent. In the metallic (relaxed) p hase, magnetoresistance maximum occurs for a field direction b' in the field of 1.2T. With decreasing temperature, the value of b'-axis magn etoresistance continuously increases in the metallic phase.