Effective spinless fermions in the strong coupling Kondo model

Abstract

Starting from the two-orbital Kondo-lattice model with classical t_2g spins, an effective spinless fermion model is derived for strong Hund coupling J_H with a projection technique. The model is studied by Monte Carlo simulations and analytically using a uniform hopping approximation. The results for the spinless fermion model are in remarkable agreement with those of the original Kondo-lattice model, independent of the carrier concentration, and even for moderate Hund coupling J_H. Phase separation, the phase diagram in uniform hopping approximation, as well as spectral properties including the formation of a pseudo-gap are discussed for both the Kondo-lattice and the effective spinless fermion model in one and three dimensions.

Revtex4, 10 pages, 15 figures, typos corrected

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• Ferromagnetic polarons in the one-dimensional ferromagnetic Kondo model with quantum mechanical S=3/2 core spins
• Magnetic Polarons in the 1D FM Kondo Model
• Polaronic Aspects of the two-dimensional Ferromagnetic Kondo Model
• Onset of metallic ferromagnetism in a doped spin-orbital chain
• Double exchange model in cubic vanadates
• From Frustrated to Unfrustrated: Coupling two triangular-lattice itinerant Quantum Magnets
• Single particle spectrum of the flux phase in the FM Kondo Model
• Aspects of the FM Kondo Model: From Unbiased MC Simulations to Back-of-an-Envelope Explanations