Temperature-dependent electronic structure and ferromagnetism in the d=oo Hubbard model studied by a modfied perturbation theory

Details Temperature-dependent electronic structure and ferromagnetism in the d=oo Hubbard model studied by a modfied perturbation theory Temperature-dependent electronic structure and ferromagnetism in the d=oo Hubbard model studied by a modfied perturbation theory

1997-12-12

arxiv.org/abs/cond-mat/9712139v2

Phys. Rev. B 57 (1998) 6211

Physics

Condensed Matter

Strongly Correlated Electrons

RevTeX, 5 pages, 6 eps figures included, Phys. Rev. B (in press), Ref. 16 corrected

Scientific paper

10.1103/PhysRevB.57.6211

The infinite-dimensional Hubbard model is studied by means of a modified perturbation theory. The approach reduces to the iterative perturbation theory for weak coupling. It is exact in the atomic limit and correctly reproduces the dispersions and the weights of the Hubbard bands in the strong-coupling regime for arbitrary fillings. Results are presented for the hyper-cubic and an fcc-type lattice. For the latter we find ferromagnetic solutions. The filling-dependent Curie temperature is compared with the results of a recent Quantum Monte Carlo study.

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