Eur. Phys. J. B 2, 457-461 (1998)
https://doi.org/10.1007/s100510050267

A scenario for the electronic state in the manganese perovskites: the orbital correlated metal

Institut Laue-Langevin, BP156, 38042 Grenoble, France

Corresponding author: ^a marcelo@ill.fr

Received: 3 October 1997
Revised: 9 December 1997
Accepted: 12 January 1998
Published online: 15 April 1998

Abstract

We propose a novel scenario for the electronic state in the manganese perovskites. We argue that, at low temperatures and within the ferromagnetic state, the physics of these colossal magnetoresistance compounds may be characterized by a correlated metallic state near a metal insulator transition where the orbital degrees of freedom play the 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.