Uniform hopping approach to the ferromagnetic Kondo model at finite temperature

Winfried Koller, Alexander Prüll, Hans Gerd Evertz, and Wolfgang von der Linden
Phys. Rev. B 67, 104432 – Published 31 March 2003
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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 core spins 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 Ak(ω) of a one-dimensional (1D) chain with nearest-neighbor Coulomb repulsion. By calculating the specific heat and the susceptibility of systems up to size 163, we determine the Curie temperature of the 3D one-orbital double-exchange model, which agrees with experimental values.

  • Received 29 November 2002

DOI:https://doi.org/10.1103/PhysRevB.67.104432

©2003 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. 67, Iss. 10 — 1 March 2003

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