Antiferromagnetism of almost localized fermions: Evolution from Slater-type to Mott-Hubbard gap

Details Antiferromagnetism of almost localized fermions: Evolution from Slater-type to Mott-Hubbard gap Antiferromagnetism of almost localized fermions: Evolution from Slater-type to Mott-Hubbard gap

2003-01-21

arxiv.org/abs/cond-mat/0301387v5

Eur. Phys. J. B 32, 315 (2003)

Physics

Condensed Matter

Strongly Correlated Electrons

17 pages with 9 figures, the revised and published version

Scientific paper

10.1140/epjb/e2003-00104-9

We supplement (and critically overview) the existing extensive analysis of antiferromagnetic solution for the Hubbard model with a detailed discussion of two specific features, namely (i) the evolution of the magnetic (Slater) gap (here renormalized by the electronic correlations) into the Mott-Hubbard or atomic gap, and (ii) a rather weak renormalization of the effective mass by the correlations in the half-filled-band case, which contrasts with that for the paramagnetic case. The mass remains strongly enhanced in the non-half-filled-band case. We also stress the difference between magnetic and non-magnetic contributions to the gap. These results are discussed within the slave boson approach in the saddle-point approximation, in which there appears a non-linear staggered molecular field due to the electronic correlations that leads to the appearance of the magnetic gap. They reproduce correctly the ground-state energy in the limit of strong correlations. A brief comparison with the solution in the limit of infinite dimensions and the corresponding situation in the doubly-degenerate-band case with one electron per atom is also made.

Affiliated with

Also associated with

No associations

Rating

Antiferromagnetism of almost localized fermions: Evolution from Slater-type to Mott-Hubbard gap does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Antiferromagnetism of almost localized fermions: Evolution from Slater-type to Mott-Hubbard gap, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Antiferromagnetism of almost localized fermions: Evolution from Slater-type to Mott-Hubbard gap will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-570998