Theory of insulator metal transition and colossal magnetoresistance in doped manganites |
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Authors: | Ramakrishnan T V Krishnamurthy H R Hassan S R Pai G Venketeswara |
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Institution: | Centre for Condensed Matter Theory, Department of Physics, Indian Institute of Science, Bangalore 560 012, India. |
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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. |
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