Work

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

Year: 2007

Type: article

Abstract: The one-orbital model for manganites with cooperative phonons and superexchange coupling JAF is investigated via large-scale Monte Carlo simulations. The results for two orbitals are also briefly discussed. Focusing on the electron density n=0.75, a regime of competition between ferromagnetic metallic and charge-ordered (CO) insulating states is identified. In the vicinity of the associated bicritical point, colossal magnetoresistance (CMR) effects are 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.

Source: Physical Review Letters

DOI: 10.1103/physrevlett.98.127202

Authors: Cengiz Şen, Gonzalo Alvarez, Elbio Dagotto

Institutions: Florida State University, National High Magnetic Field Laboratory, Oak Ridge National Laboratory, Center for Nanophase Materials Sciences, University of Tennessee at Knoxville

Language: English

Topic: Magnetic and transport properties of perovskites and related materials

Subfield: Electronic, Optical and Magnetic Materials

Field: Materials Science

Domain: Physical Sciences

Open Access status: green