Galvanomagnetic properties in the spin-density-wave phase of (TMTSF)(2)PF6

We have measured the magnetoresistance and the Hall effect in the spin-dens ity-wave (SDW) state of (TMTSF)(2)PF6 down to 2K and in magnetic fields up to 9T in order to gain an additional insight into the nature of the possibl e subphases in the SDW state. We have found that the temperature dependent magnetoresistance anisotropy changes below 4K; this change being maximal fo r the current in the lowest conductivity direction. The Hall resistivity ha s showed different magnetic field dependencies for T>4K and T<4K. The resis tivity and the Hall resistivity were also investigated as the function of t he electric field. The backflow coefficient alpha does not change below 4K.