Theory of Insulator Metal Transition and Colossal Magnetoresistance in Doped Manganites

Abstract

The persistent proximity of insulating and metallic phases, a puzzling characterestic of manganites, is argued to arise from the self organization of the twofold degenerate e_g orbitals of Mn into localized Jahn-Teller(JT) polaronic levels and broad band states due to the large electron - JT phonon coupling present in them. We describe a new two band model with strong correlations and a dynamical mean-field theory calculation of equilibrium and transport properties. These explain the insulator metal transition and colossal magnetoresistance quantitatively, as well as other consequences of two state coexistence.

References in corpus (4)

• On the Fermi Liquid to Polaron Crossover II: Double Exchange and the Physics of "Colossal" Magnetoresistance
• On the Fermi Liquid to Polaron Crossover I: General Results
• Magnetoresistance of the Double-Exchange Model in Infinite Dimension
• Role of Orbital Degeneracy in Double Exchange Systems

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