Digitale Medien
Springer
The European physical journal
96 (1995), S. 357-372
ISSN:
1434-6036
Schlagwort(e):
71.10.+x
;
71.27.+a
;
75.10.Lp
;
75.50.Bb
Quelle:
Springer Online Journal Archives 1860-2000
Thema:
Physik
Notizen:
Abstract We investigate the influence of electron correlations on the temperature-dependence of the electronic structure of ferromagnetic bcc iron by use of a manybody evaluation of a generalized model of magnetism. The single-particle part of the model-Hamiltonian is taken from an LDA band structure calculation. The manybody interactions are described by only two parameters, an intraband Coulomb interactionU and an interband exchangeJ. WithU=1.8 eV andJ=0.2 eV the self-consistent model solution yields aT=0 moment of about 2.04 µB and a Curie-temperature of 1044K. Details of the magnetic behaviour of Fe can be traced back to a striking temperature variation of the quasiparticle density of states. A novel explanation for the experimentally-observed non-collapsing exchange splitting is demonstrated in terms of the temperature-dependent spectral density for wave-vectors near the Γ-point. Typical differences in the magnetic behaviour of Fe and Ni are worked out.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1007/BF01313058
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