Theory of Insulator Metal Transition and Colossal Magnetoresistance in Doped Manganites
T. V. Ramakrishnan, H. R. Krishnamurthy, S. R. Hassan, G. V. Pai
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 eg 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.
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