MAGNETIC-FIELD INFLUENCE ON THE SPIN-DENSITY-WAVE OF THE ORGANIC CONDUCTOR (TMTSF)2NO3

We present the influence of a transverse magnetic field on the spin-de nsity wave (SDW) ground state of the organic conductor (TMTSF)2NO3. Ma gnetic field increases the single-particle activation energy. A finite magnetic field (H(C)) induces discontinuities in the magnetoresistanc e behaviour and its value is temperature dependent. The threshold elec tric field (ET) for the SDW sliding increases in a magnetic field. All observed effects are strongly angle-dependent indicating that they ar e determined by the magnetic field component along the least-conductio n (c) direction. We discuss these results in the framework of a theor etical model for the SDW with large imperfect nesting.