An Origin of CMR: Competing Phases and Disorder-Induced Insulator-to-Metal Transition in Manganites

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dc.creatorMotome, Yukitoshi
dc.creatorFurukawa, Nobuo
dc.creatorNagaosa, Naoto
dc.date2004-06-21
dc.date.accessioned2026-07-07T06:26:41Z
dc.date.available2026-07-07T06:26:41Z
dc.descriptionWe theoretically explore the mechanism of the colossal magnetoresistance in manganese oxides by explicitly taking into account the phase competition between the double-exchange ferromagnetism and the charge-ordered insulator. We find that quenched disorder causes a drastic change of the multicritical phase diagram by destroying the charge-ordered state selectively. As a result, there appears a nontrivial phenomenon of the disorder-induced insulator-to-metal transition in the multicritical regime. On the contrary, the disorder induces a highly-insulating state above the transition temperature where charge-ordering fluctuations are much enhanced. The contrasting effects provide an understanding of the mechanism of the colossal magnetoresistance. The obtained scenario is discussed in comparison with other theoretical proposals such as the polaron theory, the Anderson localization, the multicritical-fluctuation scenario, and the percolation scenario.
dc.description16 pages, 7 figures, submitted to Wandlitz Days on Magnetism: Local-Moment Ferromagnets: Unique Properties for Modern Applications
dc.identifierhttps://arxiv.org/abs/cond-mat/0406463
dc.identifierhttp://arxiv.org/abs/cond-mat/0406463
dc.identifierLecture Notes in Physics 678, 71 (2005)
dc.identifierdoi:10.1007/11417255_5
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/97180
dc.subjectStrongly Correlated Electrons
dc.titleAn Origin of CMR: Competing Phases and Disorder-Induced Insulator-to-Metal Transition in Manganites
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