title: Theory of insulator metal transition and colossal magnetoresistance in doped manganites.
abstract: The persistent proximity of insulating and metallic phases, a puzzling characteristic 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.
authors.affiliation: Centre for Condensed Matter Theory, Department of Physics, Indian Institute of Science, Bangalore 560 012, India.
authors.forename: T V
authors.initials: TV
authors.lastname: Ramakrishnan
authors.forename: H R
authors.initials: HR
authors.lastname: Krishnamurthy
authors.forename: S R
authors.initials: SR
authors.lastname: Hassan
authors.forename: G Venketeswara
authors.initials: GV
authors.lastname: Pai