Pseudogaps in nested antiferromagnets
Abstract
We analyze the fluctuation corrections to magnetic ordering in the case of a threedimensional 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 selfenergy 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.
 Publication:

Physical Review B
 Pub Date:
 February 2004
 DOI:
 10.1103/PhysRevB.69.060402
 arXiv:
 arXiv:condmat/0309580
 Bibcode:
 2004PhRvB..69f0402P
 Keywords:

 75.30.Fv;
 71.10.Hf;
 78.20.Bh;
 Spindensity waves;
 NonFermiliquid ground states electron phase diagrams and phase transitions in model systems;
 Theory models and numerical simulation;
 Condensed Matter  Strongly Correlated Electrons
 EPrint:
 4 pages, 4 figures