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

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 Lab. (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). National Center for Computational Sciences (NCCS)
Sponsoring Organization:
USDOE Office of Science (SC); USDOE Laboratory Directed Research and Development (LDRD) Program
DOE Contract Number:
DE-AC05-00OR22725
OSTI ID:
931476
Journal Information:
Physical Review Letters, Vol. 98; ISSN 0031-9007
Country of Publication:
United States
Language:
English

References (27)

The physics of manganites: Structure and transport journal August 2001
Evidence for magnetic polarons in the magnetoresistive perovskites journal March 1997
Percolative phase separation underlies colossal magnetoresistance in mixed-valent manganites journal June 1999
Colossal magnetoresistant materials: the key role of phase separation journal April 2001
Phase Separation Scenario for Manganese Oxides and Related Materials journal March 1999
Static and dynamical properties of the ferromagnetic Kondo model with direct antiferromagnetic coupling between the localized t 2 g electrons journal September 1998
Discontinuous transitions in double-exchange materials journal January 2001
Variational mean-field approach to the double-exchange model journal January 2001
Complexity in Strongly Correlated Electronic Systems journal July 2005
Colossal Effects in Transition Metal Oxides Caused by Intrinsic Inhomogeneities journal December 2001
Relevance of Cooperative Lattice Effects and Stress Fields in Phase-Separation Theories for CMR Manganites journal March 2004
Lattice-Spin Mechanism in Colossal Magnetoresistive Manganites journal March 2002
Insulator-Metal Phase Diagram of the Optimally Doped Manganites from the Disordered Holstein-Double Exchange Model journal January 2006
Singular Effect of Disorder on Electronic Transport in Strongly Coupled Electron-Phonon Systems journal April 2005
Structural Disorder Induced Polaron Formation and Magnetic Scattering in the Disordered Holstein-Double Exchange Model journal January 2005
Colossal magnetoresistance observed in Monte Carlo simulations of the one- and two-orbital models for manganites journal June 2006
Charge-orbital ordering and phase separation in the two-orbital model for manganites: Roles of Jahn-Teller phononic and Coulombic interactions journal October 2000
Computational implementation of the Kubo formula for the static conductance: Application to two-dimensional quantum dots journal April 1999
Global phase diagram of perovskite manganites in the plane of quenched disorder versus one-electron bandwidth journal July 2004
Colossal Magnetoresistance without Phase Separation: Disorder-Induced Spin Glass State and Nanometer Scale Orbital-Charge Correlation in Half Doped Manganites journal November 2004
Theoretical study of half-doped models for manganites: Fragility of CE phase with disorder, two types of colossal magnetoresistance, and charge-ordered states for electron-doped materials journal September 2003
Competing Orders and Disorder-Induced Insulator to Metal Transition in Manganites journal October 2003
Charge Ordering and Polaron Formation in the Magnetoresistive Oxide La 0.7 Ca 0.3 MnO 3 journal October 2000
Glass Transition in the Polaron Dynamics of Colossal Magnetoresistive Manganites journal July 2002
k -Dependent Electronic Structure, a Large “Ghost” Fermi Surface, and a Pseudogap in a Layered Magnetoresistive Oxide journal July 1998
Pseudogap Formation in Models for Manganites journal October 1999
Polarons and confinement of electronic motion to two dimensions in a layered manganite journal April 2006

Similar Records

Electronic structure of CMR manganites (invited)
Journal Article · Tue Apr 01 00:00:00 EST 1997 · Journal of Applied Physics · OSTI ID:931476
Study of the Short-distance spin and charge correlations and local density-of-states in the CMR regime of the one-orbital model for manganites.
Journal Article · Tue Jan 01 00:00:00 EST 2008 · Physical Review B · OSTI ID:931476
+2 more
First Order CMR Transitions in the Two-Orbital Model for Manganites
Journal Article · Fri Jan 01 00:00:00 EST 2010 · Physical Review Letters · OSTI ID:931476

Related Subjects

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