ELFT HÍRADÓ

[szpl <szpl AT metal.elte.hu>]

ELTE Fizikai Intézet

                                ORTVAY KOLLOKVIUM

                    2016. március 3., csütörtök, 15:00-kor
                Az ELTE Pázmány Péter s. 1/A alatti épületében
                           földszinti 0.81 előadóban

        Oroszlány László (ELTE, Komplex Rendszerek Fizikája Tanszék)

        "Magnetism of Gadolinium: A First-Principles Perspective"

Kivonatos ismertetés:
By calculating the spectral density of states in the ferromagnetic ground 
state and in the high temperature paramagnetic phase we provide the first 
concise study of finite temperature effects on the electronic structure of 
the bulk and the surface of gadolinium metal. The variation of calculated 
spectral properties of the Fermi surface and the density of states in the 
bulk and at the surface are in good agreement with recent photoemission 
experiments performed in both ferromagnetic and paramagnetic phases. In the 
paramagnetic state we find vanishing spin splitting of the conduction band, 
but finite local spin moments both in bulk and at the surface. We clearly 
demonstrate that the formation of these local spin moments in the conduction 
band is due to the asymmetry of the density of states in the two spin channels,
suggesting a complex, non-Stoner behavior. We, therefore, suggest that the 
vanishing or nearly vanishing spin splitting of spectral features cannot be 
used as an indicator for Stoner-like magnetism.