Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
1996-12-10
Physics
Condensed Matter
Strongly Correlated Electrons
5 pages, revtex, 3 ps-figures included. The results remain unchanged but many changes were introduced in the text for improved
Scientific paper
We argue that, at low temperatures and well into the ferromagnetic phase, the physics of the manganase perovskites may be characterized by a correlated metallic state near a metal insulator transition where the orbital degrees of freedom play a main role. This follows from the observation that a two-band degenerate Hubbard model under a strong magnetic field can be mapped onto a para-orbital single band model. We solve the model numerically using the quantum Monte Carlo technique within a dynamical mean field theory which is exact in the limit of large lattice connectivity. We argue that the proposed scenario may allow for the qualitative interpretation of a variety of experiments which were also observed in other (early) transition metal oxides.
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