skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

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

Abstract

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.

Authors:
 [1];  [2];  [2]
  1. Florida State University
  2. ORNL
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Center for Nanophase Materials Sciences; Center for Computational Sciences
Sponsoring Org.:
USDOE Laboratory Directed Research and Development (LDRD) Program; USDOE Office of Science (SC)
OSTI Identifier:
931476
DOE Contract Number:  
DE-AC05-00OR22725
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review Letters; Journal Volume: 98
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; ELECTRON DENSITY; FOCUSING; MAGNETORESISTANCE; ORIGIN; PHONONS; POLARONS; SPIN

Citation Formats

Sen, Cengiz, Alvarez, Gonzalo, and Dagotto, Elbio R. Competing Ferromagnetic and Charge ordered states in models for manganites: The Origin of the CMR effect. United States: N. p., 2007. Web. doi:10.1103/PhysRevLett.98.127202.
Sen, Cengiz, Alvarez, Gonzalo, & Dagotto, Elbio R. Competing Ferromagnetic and Charge ordered states in models for manganites: The Origin of the CMR effect. United States. doi:10.1103/PhysRevLett.98.127202.
Sen, Cengiz, Alvarez, Gonzalo, and Dagotto, Elbio R. Mon . "Competing Ferromagnetic and Charge ordered states in models for manganites: The Origin of the CMR effect". United States. doi:10.1103/PhysRevLett.98.127202.
@article{osti_931476,
title = {Competing Ferromagnetic and Charge ordered states in models for manganites: The Origin of the CMR effect},
author = {Sen, Cengiz and Alvarez, Gonzalo and Dagotto, Elbio R},
abstractNote = {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.},
doi = {10.1103/PhysRevLett.98.127202},
journal = {Physical Review Letters},
number = ,
volume = 98,
place = {United States},
year = {Mon Jan 01 00:00:00 EST 2007},
month = {Mon Jan 01 00:00:00 EST 2007}
}