Effective spinless fermions in the strong-coupling Kondo model

Winfried Koller, Alexander Prüll, Hans Gerd Evertz, and Wolfgang von der Linden
Phys. Rev. B 66, 144425 – Published 31 October 2002
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Abstract

Starting from the two-orbital Kondo-lattice model with classical t2g spins, an effective spinless fermion model is derived for strong Hund coupling JH 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 JH. 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.

  • Received 6 June 2002

DOI:https://doi.org/10.1103/PhysRevB.66.144425

©2002 American Physical Society

Authors & Affiliations

Winfried Koller*, Alexander Prüll, Hans Gerd Evertz, and Wolfgang von der Linden

  • Institut für Theoretische Physik, Technische Universität Graz, Petersgasse 16, A-8010 Graz, Austria

  • *Electronic address: koller@itp.tu-graz.ac.at

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Issue

Vol. 66, Iss. 14 — 1 October 2002

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