Uniform hopping approach to the ferromagnetic Kondo model at finite temperature

2002/11/29 by Winfried Koller, Alexander Pruell, Alexander Prüll +2
Materials Science · Physics and Astronomy · #Magnetic and transport properties of perovskites and related materials #Magnetism in coordination complexes #Physics of Superconductivity and Magnetism #cond-mat.str-el

paper · pdf · doi:10.1103/physrevb.67.104432

published as Phys. Rev. B 67 104432 (2003) · 11 pages, 9 figures, RevTex4, additional references cited

arxiv created 2002/11/29 · openalex publication_date 2003/03/31 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28

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 A_k(\ensuremathω) 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.

Citations

• Effective spinless fermions in the strong-coupling Kondo model

Related

• Exactly solvable Kondo problem in the open t-J chains
• Kondo temperature of Anderson impurity model in a quantum wire with spin-orbit coupling
• Single-particle spectrum of the flux phase in the FM Kondo model
• Kondo lattice model: from local to non-local descriptions
• Kondo effect in "bad metals"