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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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|
|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|
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