Dynamical mean field theory for transition temperature and optics of CMR manganites

Abstract

A tight binding parametrization of local spin density functional band theory is combined with a dynamical mean field treatment of correlations to obtain a theory of the magnetic transition temperature, optical conductivity and T=0 spinwave stiffness of a minimal model for the pseudocubic metallic $CMR$ manganites such a $L{a}_{1-X}S{r}_{x}Mn{O}_3$. The results indicate that previous estimates of $T_c$ obtained by one of us (Phys. Rev. \textbf{B61} 10738-49 (2000)) are in error, that in fact the materials are characterized by Hunds coupling $J\approx 1.5eV$, and that magnetic-order driven changes in the kinetic energy may not be the cause of the observed 'colossal' magnetoresistive and multiphase behavior in the manganites, raising questions about our present understanding of these materials.

Published version; 10 pages, 9 figures

References in corpus (2)

• Magnetic Polarons in the 1D FM Kondo Model
• Effective spinless fermions in the strong coupling Kondo model

Cited by in corpus (16)

• Electronic Structure Calculations with Dynamical Mean-Field Theory: A Spectral Density Functional Approach
• Half-Metallicity of LSMO
• Dynamical Mean Field Study of Model Double-Exchange Superlattices
• Theory of Manganite Superlattice
• Localization of strongly correlated electrons as Jahn-Teller polarons in manganites
• Effects of the On-Site Coulomb Repulsion in Double Exchange Magnets
• Theoretical Description of Pseudocubic Manganites
• Direct observation of double exchange in ferromagnetic La${}_{0.7}$Sr${}_{0.3}$CoO${}_3$ by broadband ellipsometry
• Short-Range Ordered Phase of the Double-Exchange Model in Infinite Dimensions
• New Correlated Model of Colossal Magnetoresistive Manganese Oxides
• Transition Temperature of a Magnetic Semiconductor with Angular Momentum j
• Pressure Induced Charge Disproportionation in LaMnO${}_3$
• Thermodynamic Consistency of the Dynamical Mean-Field Theory of the Double-Exchange Model
• Magnetic Instabilities and Phase Diagram of the Double-Exchange Model in Infinite Dimensions
• Dynamical Mean Field Theory of Temperature and Field Dependent Band Shifts in Magnetically Coupled Semimetals: Applocation to EuB6
• Oxygen isotope effect and phase separation in the optical conductivity of (La${}_{0.5}$Pr${}_{0.5}$)${}_{0.7}$Ca${}_{0.3}$MnO${}_3$ thin films