Finite temperature magnetism in Gd: evidence against a Stoner behavior.
The temperature dependence of the rare-earth valence bands has been regarded as a realization of the Stoner behavior. The exchange splitting of the electronic states appears to scale as the magnetic order parameter for T<T(C) and to vanish at T = T(C). We report here a spin-resolved photoemission study on the evolution of Gd bulk bands for 0.5< or =T/T(C)< or=1. The spin-polarized spectral line shapes display a complex temperature dependence, which clearly contrasts with the interpretation of previous experimental results. The spin-resolved photoemission data demonstrate the inadequacy of the Stoner model to the description of magnetism in rare earths.
Maiti
K
K
Institut für Festkörperforschung, Forschungszentrum Jülich, D-52428 Jülich, Germany.
Malagoli
M C
MC
Dallmeyer
A
A
Carbone
C
C