Dynamical Mean-Field Study of the Ferromagnetic Transition Temperature of a Two-Band Model for Colossal Magnetoresistance Materials

Abstract

The ferromagnetic (FM) transition temperature (Tc) of a two-band Double-Exchange (DE) model for colossal magnetoresistance (CMR) materials is studied using dynamical mean-field theory (DMFT), in wide ranges of coupling constants, hopping parameters, and carrier densities. The results are shown to be in excellent agreement with Monte Carlo simulations. When the bands overlap, the value of Tc is found to be much larger than in the one-band case, for all values of the chemical potential within the energy overlap interval. A nonzero interband hopping produces an additional substantial increase of Tc, showing the importance of these nondiagonal terms, and the concomitant use of multiband models, to boost up the critical temperatures in DE-based theories.

arXiv comment4 pages, 4 eps figures

References in corpus (11)

• Transport Properties of the Kondo Lattice Model in the Limit $S=\infty$ and $D=\infty$
• Nodal quasiparticle in pseudogapped colossal magnetoresistive manganites
• Magnetic Transition Temperature of (La,Sr)MnO${}_3$
• Temperature Dependence of the Conductivity in (La,Sr)MnO${}_3$
• Ferromagnetic transition in a double-exchange system
• Ferromagnetic transition in a double-exchange system containing impurities
• Critical Temperatures of a Two-Band Model for Diluted Magnetic Semiconductors
• Ferromagnetic transition in a double-exchange system containing impurities in the Dynamical Mean Field Approximation
• Paramagnetic-ferromagnetic transition in a double-exchange model
• Ground state of a double-exchange system containing impurities: bounds of ferromagnetism
• Thermodynamic Consistency of the Dynamical Mean-Field Theory of the Double-Exchange Model

Cited by in corpus (1)

• Curie temperature of the two band double exchange model for manganites