  Among known Bechgaard and Fabre salts (TMTSF)2NO3 is unique since it never
becomes superconducting even under pressure. Also, though (TMTSF)2NO3 undergoes
the spin density wave (SDW) transition, the low temperature transport is
semimetallic and gapless. We propose: a) the absence of the superconductivity
is due to the inverse symmetry breaking associated with the anion ordering at
45K; b) the SDW state below 9K should be unconventional as seen from the angle
dependent magnetoresistance oscillation (AMRO); c) a new phase diagram for
Bechgaard salts, where unconventional spin density wave (USDW) occupies the
prominent space.
