Power law field dependence of the 2D magnetoresistance in (TMTSF)(2)PF6

The magnetoresistance of the quasi-one-dimensional organic conductor (TMTSF )(2)PF6 is studied for currents flowing parallel to the best conducting a a nd second best conducting b directions in magnetic fields perpendicular to the a-b plane under a hydrostatic pressure of 0.8 GPa. As a function of the magnetic field, the magnetoresistance follows a power law Delta R/R=(B / B -0)(3/2) both in the a and b directions. The a-b plane conductivity anisotr opy is field independent. The scaling field B-0, characterizing the strengt h of the magnetoresistance, follows an exponential temperature dependence B -0 proportional to exp(T/T-0) with a field-independent characteristic tempe rature T-0 = 10 K.