Theory of insulator metal transition and colossal magnetoresistance in doped manganites

Ramakrishnan, T. V. ; Krishnamurthy, H. R. ; Hassan, S. R. ; Venketeswara Pai, G. (2004) Theory of insulator metal transition and colossal magnetoresistance in doped manganites Physical Review Letters, 92 (15). 157203_1-157203_4. ISSN 0031-9007

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Official URL: http://prl.aps.org/abstract/PRL/v92/i15/e157203

Related URL: http://dx.doi.org/10.1103/PhysRevLett.92.157203

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 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.

Item Type:Article
Source:Copyright of this article belongs to American Physical Society.
ID Code:17501
Deposited On:16 Nov 2010 09:41
Last Modified:17 May 2016 02:07

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