Temperature-dependent electronic structure of gadolinium |
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Authors: | W Nolting T Dambeck G Borstel |
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Institution: | (1) Facultad de Ciencias, Fisica Teórica Universidad de Valladolid, E-47011 Valladolid, Spain;(2) Fachbereich Physik, Universität Osnabrück, D-49069 Osnabrück, Germany;(3) Present address: Lehrstuhl Festkörpertheorie, Humboldt-Universität, Invalidenstrasse 110, D-10115 Berlin, Germany |
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Abstract: | We investigate the electronic structure of the ferromagnetic 4f-metal Gadolinium by use of a many-body evaluation of a generalized model of magnetism, the one-particle part of which is derived from an ASW-LSDA bandstructure calculation. A striking temperature-dependence of the conduction band states is traced back to a 4f-(5d, 6s) interband exchange. The conduction electron polarization (0.63
B
atT=0) decreases forT T
c
very similar to the 4f-magnetization. A red shift of the lower -band edge of about 0.25 eV appears upon cooling fromT=T
c
toT=0. — The quasiparticle band-structure exibits a remarkable non uniform magnetic behaviour at different positions in the Brillouin zone, and in particular for different subbands. Weakly correlated ( s-like ) dispersions show a Stoner-like T-dependence of the exchange splitting. On the other hand, stronger correlated ( d-like ) dispersions split belowT
c
into four branches, two for each spin direction. TheirT-dependence mainly concerns the spectral weights of the quasiparticle peaks and not so much the energetic positions. An exchange caused splitting remains even forT<T
c
. |
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Keywords: | 71 10+x 75 30 Et 75 50 Cc |
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