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TT: Tiefe Temperaturen

TT 14: Postersitzung II: Korrelierte Systeme(1-40), Theorie der Supraleitung(41-50), Metall-Isolator-Übergang, Lokalisierung(51-66), Niederdimensionale Systeme, Quantenhalleffekt(67-80), Pinning, kritische Ströme und Vortexdynamik(81-93), HTSL-Drähte und -Bänder(94-98), Massive HTSL(99-104), supraleitende Borkarbide(105-109)

TT 14.38: Poster

Mittwoch, 19. März 1997, 15:00–18:30, Z1

Quasiparticle band-structure of antiferromagnetic EuTe — •S. Mathi Jaya, W. Nolting, and S. Rex — Institut für Physik, Humboldt–Universität zu Berlin

A many-body model calculation (s-f model) is combined with a one-electron band-structure calculation (LMTO) to get the temperature dependent sublattice properties of the prototypical Heisenberg antiferromagnet EuTe. The results are discussed in terms of quasiparticle density of states and k-resolved spectral functions. A striking temperature dependence of the empty (5d,6s) conduction bands is observed as a consequence of the 4f-(5d,6s) interband exchange interaction. Strong correlations lead to dispersion splittings and the appearance of typical quasiparticles (magnetic polaron).