Charge Localization in Disordered Colossal-Magnetoresistance Manganites

Details Charge Localization in Disordered Colossal-Magnetoresistance Manganites Charge Localization in Disordered Colossal-Magnetoresistance Manganites

1996-12-04

arxiv.org/abs/cond-mat/9612046v1

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, RevTex. 4 Figures included

Scientific paper

10.1103/PhysRevB.56.4541

The metallic or insulating nature of the paramagnetic phase of the colossal-magnetoresistance manganites is investigated via a double exchange Hamiltonian with diagonal disorder. Mobility edge trajectory is determined with the transfer matrix method. Density of states calculations indicate that random hopping alone is not sufficient to induce Anderson localization at the Fermi level with 20-30% doping. We argue that the metal-insulator transtion is likely due to the formation of localized polarons from nonuniform extended states as the effective band width is reduced by random hoppings and electron-electron interactions.

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