Competing Ferromagnetic and Charge-Ordered States in Models for Manganites: the Origin of the CMR Effect

Details Competing Ferromagnetic and Charge-Ordered States in Models for Manganites: the Origin of the CMR Effect Competing Ferromagnetic and Charge-Ordered States in Models for Manganites: the Origin of the CMR Effect

2007-02-19

arxiv.org/abs/cond-mat/0702426v1

Phys. Rev. Lett. 98, 127202 (2007)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 4 figures, accepted for publication in the Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.98.127202

The one-orbital model for manganites with cooperative phonons and superexchange coupling $J_{\rm AF}$ has been investigated via large-scale Monte Carlo (MC) simulations. Results for two-orbitals are also briefly discussed. Focusing on electronic density $n$=0.75, a regime of competition between ferromagnetic (FM) metallic and charge-ordered (CO) insulating states was identified. In the vicinity of the associated bicritical point, colossal magnetoresistance (CMR) effects were observed. The CMR is associated with the development of short-distance correlations among polarons, above the spin ordering temperatures, resembling the charge arrangement of the low-temperature CO state.

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