Uniform hopping approach to the FM Kondo Model at finite temperature

Abstract

We study the ferromagnetic Kondo model with classical corespins via unbiased Monte-Carlo simulations and derive a simplified model for the treatment of the corespins at any temperature. Our simplified model captures the main aspects of the Kondo model and can easily be evaluated both numerically and analytically. It provides a better qualitative understanding of the physical features of the Kondo model and rationalizes the Monte-Carlo results, including the spectral density A_k(omega) of a 1D chain with nearest neighbor Coulomb repulsion. By calculating the specific heat and the susceptibility of systems up to size 16^3, we determine the Curie temperature of the 3D one-orbital double-exchange model, which agrees with experimental values.

11 pages, 9 figures, RevTex4, additional references cited

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Cited by in corpus (10)

• Orbital polarons versus itinerant e_g electrons in doped manganites
• Doping dependence of spin and orbital correlations in layered manganites
• Magnetic Polarons in the 1D FM Kondo Model
• Temperature effects in a spin-orbital model for manganites
• Polaronic Aspects of the two-dimensional Ferromagnetic Kondo Model
• Onset of metallic ferromagnetism in a doped spin-orbital chain
• Proper weak-coupling approach to the periodic s-d(f) exchange model
• Theory for charge and orbital density-wave states in manganite La${}_{0.5}$Sr${}_{1.5}$MnO${}_4$
• Two-band ferromagnetic Kondo-lattice model for local-moment half-metals
• Aspects of the FM Kondo Model: From Unbiased MC Simulations to Back-of-an-Envelope Explanations