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Magnons in the Ferromagnetic Kondo‐Lattice Model
Author(s) -
Vogt M.,
Santos C.,
Nolting W.
Publication year - 2001
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/1521-3951(200102)223:3<679::aid-pssb679>3.0.co;2-p
Subject(s) - magnon , ferromagnetism , condensed matter physics , lattice (music) , physics , acoustics
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 stiffnes 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 .