Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2011-09-21
Phys. Rev. B 85, 024404 (2012)
Physics
Condensed Matter
Strongly Correlated Electrons
added one figure, slight modification to the text
Scientific paper
10.1103/PhysRevB.85.024404
Detailed analysis of the magnetic properties of the Hubbard model within dynamical mean-field theory (DMFT) is presented. Using a RPA-like decoupling of two-particle propagators we derive a universal form for susceptibilities, which captures essential aspects of localized and itinerant pictures. This expression is shown to be quantitatively valid whenever long-range coherence of particle-hole excitations can be neglected, as is the case in large parts of the phase diagram where antiferromag- netism is dominant. The applicability of an interpretation in terms of the two archetypical pictures of magnetism is investigated for the Hubbard model on a body-centered cubic lattice with additional next-nearest neighbor hopping t'. For large values of the Coulomb interaction, local-moment mag- netism is found to be dominant, while for weakly interacting band electrons itinerant quasiparticle magnetism prevails. In the intermediate regime and for finite t' an re-entrant behavior is discovered, where antiferromagnetism only exists in a finite temperature interval.
Grewe Norbert
Jabben Torben
Schmitt Sebastian
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