Magnetic field dependence of the SDW phase in (TMTSF)2PF6 under pressure

Abstract The transverse magnetoresistance has been measured in (TMTSF) 2 PF 6 under pressure, with the field parallel to the c ∗ axis. At 0.85 GPa, the spin-density-wave (SDW) transition temperature T SDW increases quadratically with the applied magnetic field, and a saturation behavior is observed in high magnetic fields. These results are consistent with the mean field theory. From these behaviors, T SDW for the perfect nesting case, Fermi velocity and imperfect nesting parameter at 0.85 GPa are estimated as T SDW0 =14.5 K, v F =8.55×10 4 m/s and e 0 / Δ 0 =0.996 using the mean field theory, respectively. The SDW phase diagram of (TMTSF) 2 X can be described by taking into account the reduction of the coupling constant by the pressure.