Theory of Insulator Metal Transition and Colossal Magnetoresistance in Doped Manganites

Ramakrishnan, TV and Krishnamurthy, HR and Hassan, SR and Pai, Venketeswara G (2004) Theory of Insulator Metal Transition and Colossal Magnetoresistance in Doped Manganites. In: Physical Review Letters, 92 (15). 157203-1-157203-4.

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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.

Item Type:	Journal Article
Publication:	Physical Review Letters
Publisher:	American Physical Society
Additional Information:	The copyright belongs to American Physical Society.
Department/Centre:	Division of Physical & Mathematical Sciences > Physics
Date Deposited:	17 May 2006
Last Modified:	19 Sep 2010 04:26
URI:	http://eprints.iisc.ac.in/id/eprint/6702

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