9 research outputs found
Uniform hopping approach to the FM Kondo Model at finite temperature
We study the ferromagnetic Kondo model with classical corespins via unbiased
Monte-Carlo simulations and derive a simplified model for the treatment of the
corespins 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(omega) of a 1D chain with nearest neighbor Coulomb repulsion. By
calculating the specific heat and the susceptibility of systems up to size
16^3, we determine the Curie temperature of the 3D one-orbital double-exchange
model, which agrees with experimental values.Comment: 11 pages, 9 figures, RevTex4, additional references cite