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The infinite-dimensional Hubbard model is studied by means of a modifiedperturbation theory. The approach reduces to the iterative perturbation theoryfor weak coupling. It is exact in the atomic limit and correctly reproduces thedispersions and the weights of the Hubbard bands in the strong-coupling regimefor arbitrary fillings. Results are presented for the hyper-cubic and anfcc-type lattice. For the latter we find ferromagnetic solutions. Thefilling-dependent Curie temperature is compared with the results of a recentQuantum Monte Carlo study.Comment: RevTeX, 5 pages, 6 eps figures included, Phys. Rev. B (in press),  Ref. 16 correcte

physical review. b, condensed matter

Temperature-dependent electronic structure and ferromagnetism in the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>d</mml:mi><mml:mo>=</mml:mo><mml:mi>∞</mml:mi></mml:math>Hubbard model studied by a modified perturbation theory

Temperature-dependent electronic structure and ferromagnetism in thed=∞Hubbard model studied by a modified perturbation theory