Magnons in the ferromagnetic Kondo-lattice model

Details Magnons in the ferromagnetic Kondo-lattice model Magnons in the ferromagnetic Kondo-lattice model

2000-12-06

arxiv.org/abs/cond-mat/0012086v1

Physics

Condensed Matter

Strongly Correlated Electrons

15 pages, 6 figures, to appear in phys. stat. sol. b

Scientific paper

The magnetic properties of the ferromagnetic Kondo-lattice model (FKLM) are investigated. Starting from an analysis of the magnon spectrum in the spin-wave regime, we examine the ferromagnetic stability as a function of the occupation of the conduction band $n$ and the strength $J$ of the coupling between the localised moments and the conduction electrons. From the properties of the spin-wave stiffness $D$ the ferromagnetic phase at zero temperature is derived. Using an approximate formula the critical temperature $T_c$ is calculated as a function of $J$ and $n$.

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