  We analyze the fluctuation corrections to magnetic ordering in the case of a
3D antiferromagnet with flat Fermi surfaces, as physically realized in the case
of chromium, and find that they are insufficient to produce a quantum critical
point. This implies that the critical point observed in vandium doped chromium
is due to a loss of nesting. We also derive the fermion self-energy in the
paramagnetic phase and find that a pseudogap exists, though its magnitude is
significantly reduced as compared to the spectral gap in the ordered state in
the limit where the latter is small in comparison to the Fermi energy.
