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Competing Ferromagnetic and Charge ordered states in models for manganites: The Origin of the CMR effect

Journal Article · · Physical Review Letters
 [1];  [2];  [2]
  1. Florida State University
  2. ORNL
+ Show Author Affiliations

The one-orbital model for manganites with cooperative phonons and superexchange coupling J{sub AF} 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.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF); Oak Ridge National Laboratory (ORNL); Center for Nanophase Materials Sciences; Center for Computational Sciences
Sponsoring Organization:
DOE Office of Science; ORNL LDRD Director's R&D; SC USDOE - Office of Science (SC)
DOE Contract Number:
AC05-00OR22725
OSTI ID:
931476
Journal Information:
Physical Review Letters, Journal Name: Physical Review Letters Vol. 98; ISSN 0031-9007; ISSN PRLTAO
Country of Publication:
United States
Language:
English

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Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ELECTRON DENSITY
FOCUSING
MAGNETORESISTANCE
ORIGIN
PHONONS
POLARONS
SPIN