Effective spinless fermions in the strong-coupling Kondo model

2002/06/30 by Winfried Koller, Alexander Pruell, Alexander Prüll +2 · 2 citations
Materials Science · Physics and Astronomy · #Magnetic and transport properties of perovskites and related materials #Physics of Superconductivity and Magnetism #Rare-earth and actinide compounds #cond-mat.str-el

paper · pdf · doi:10.1103/physrevb.66.144425

published as Phys. Rev. B 66, 144425 (2002) · Revtex4, 10 pages, 15 figures, typos corrected

openalex publication_date 2002/10/31 · arxiv created 2002/11/21 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

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 pseudogap are discussed for both the Kondo-lattice and the effective spinless fermion model in one and three dimensions.

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