Itinerant ferromagnetism in the multiorbital Hubbard model: a dynamical mean-field study

Details Itinerant ferromagnetism in the multiorbital Hubbard model: a dynamical mean-field study Itinerant ferromagnetism in the multiorbital Hubbard model: a dynamical mean-field study

2007-06-21

arxiv.org/abs/0706.3109v1

Phys. Rev. Lett. 99, 216402 (2007)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 5 figures

Scientific paper

10.1103/PhysRevLett.99.216402

In order to resolve the long-standing issue of how the itinerant ferromagnetism is affected by the lattice structure and Hund's coupling, we have compared various three-dimensional lattice structures in the single- and multiorbital Hubbard models with the dynamical mean-field theory with an improved quantum Monte Carlo algorithm that preserves the spin-SU(2) symmetry. The result indicates that {\it both} the lattice structure and the d-orbital degeneracy are essential for the ferromagnetism in the parameter region representing a transition metal. Specifically, (a) Hund's coupling, despite the common belief, is important, which is here identified to come from particle-hole scatterings, and (b) the ferromagnetism is a correlation effect (outside the Stoner picture) as indicated from the band-filling dependence.

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