Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2004-06-21
Lecture Notes in Physics 678, 71 (2005)
Physics
Condensed Matter
Strongly Correlated Electrons
16 pages, 7 figures, submitted to Wandlitz Days on Magnetism: Local-Moment Ferromagnets: Unique Properties for Modern Applicat
Scientific paper
10.1007/11417255_5
We 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.
Furukawa Nobuo
Motome Yukitoshi
Nagaosa Naoto
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