TY - JOUR
T1 - Competing Ferromagnetic and Charge-Ordered States in Models for Manganites
T2 - The Origin of the Colossal Magnetoresistance Effect
AU - Şen, Cengiz
AU - Alvarez, Gonzalo
AU - Dagotto, Elbio
PY - 2007/3/21
Y1 - 2007/3/21
N2 - 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.
AB - 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.
UR - https://www.scopus.com/pages/publications/33947599530
U2 - 10.1103/PhysRevLett.98.127202
DO - 10.1103/PhysRevLett.98.127202
M3 - Article
AN - SCOPUS:33947599530
SN - 0031-9007
VL - 98
JO - Physical Review Letters
JF - Physical Review Letters
IS - 12
M1 - 127202
ER -