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Ferromagnetism in a Realistic Two-Band Model: A Slave Boson Study

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Abstract

Using a slave boson representation of multi-band Hubbard models, we investigate a two-band model relevant to layered perovskites in the vicinity of half-filling. Beside the strong influence of the Hund's rule coupling, we obtain that the phase diagram separates into two regions: a weak to moderate coupling region where the effective mass is weakly renormalized, and a strong coupling regime where it is strongly renormalized. The transition between these two regimes is very sharp. It takes place in a (vanishingly) small domain. A ferromagnetic instability in only found in the strongly correlated regime, and is triggered by the Hund's rule coupling. The results are compared to La-doped layered ruthenates.

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Authors and Affiliations

  1. Institut de Physique, Université de Neuchâtel, A.-L. Breguet 1, 2000, Neuchâtel, Switzerland

    Raymond Frésard & Mathieu Lamboley

  2. Laboratoire Crismat, UMR 6508 du Centre National de la Recherche Scientifique et de l'Institut des Sciences de la Matière et du Rayonnement, 6, Bld. du Maréchal Juin, 14050, Caen Cedex, France

    Raymond Frésard

  3. Laboratoire de Génie Médical, EPFL, PSE A, 1015, Lausanne, Switzerland

    Mathieu Lamboley

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  1. Raymond Frésard
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Frésard, R., Lamboley, M. Ferromagnetism in a Realistic Two-Band Model: A Slave Boson Study. Journal of Low Temperature Physics 126, 1091–1105 (2002). https://doi.org/10.1023/A:1013815313109

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