Theory of Insulator Metal Transition and Colossal Magnetoresistance in Doped Manganites

Details Theory of Insulator Metal Transition and Colossal Magnetoresistance in Doped Manganites Theory of Insulator Metal Transition and Colossal Magnetoresistance in Doped Manganites

2003-08-19

arxiv.org/abs/cond-mat/0308376v1

Physics

Condensed Matter

Strongly Correlated Electrons

Scientific paper

10.1103/PhysRevLett.92.157203

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.

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