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Pseudogaps in Nested Antiferromagnets

Authors
  • Pepin, C.
  • Norman, M. R.
Type
Published Article
Publication Date
Sep 25, 2003
Submission Date
Sep 25, 2003
Identifiers
DOI: 10.1103/PhysRevB.69.060402
arXiv ID: cond-mat/0309580
Source
arXiv
License
Unknown
External links

Abstract

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.

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