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Intrinsic Electron localization in manganites

Ramakrishnan, TV (2010) Intrinsic Electron localization in manganites. In: International Journal of Modern Physics B, 24 (12-13). pp. 1664-1679.

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Official URL: http://www.worldscinet.com/ijmpb/24/2412n13/S02179...


We mention here an unusual disorder effect in manganites, namely the ubiquitous hopping behavior for electron transport observed in them over a wide range of doping. We argue that the implied Anderson localization is intrinsic to manganites, because of the existence of polarons in them which are spatially localized, generally at random sites (unless there is polaron ordering). We have developed a microscopic two fluid lb model for manganites, where l denotes lattice site localized l polarons, and b denotes band electrons. Using this, and the self-consistent theory of localization, we show that the occupied b states are Anderson localized in a large range of doping due to the scattering of b electrons from l polarons. Numerical simulations which further include the effect of long range Coulomb interactions support this, as well the existence of a novel polaronic Coulomb glass. A consequence is the inevitable hopping behaviour for electron transport observed in doped insulating manganites.

Item Type: Journal Article
Publication: International Journal of Modern Physics B
Publisher: World Scientific Publishing Company
Additional Information: Copyright of this article belongs to World Scientific Publishing Company.
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Date Deposited: 14 Jul 2010 04:36
Last Modified: 14 Jul 2010 04:36
URI: http://eprints.iisc.ac.in/id/eprint/28973

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