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MM: Fachverband Metall- und Materialphysik

MM 26: Electronic properties III

MM 26.6: Talk

Wednesday, March 28, 2007, 18:00–18:15, H6

High-resolution ARUPS on single crystalline FeSi[100] — •M. Klein¹, D. Zur², D. Menzel², J. Schoenes², M. Neef³, K. Doll³, G. Zwicknagl³, and F. Reinert¹ — ¹Universität Würzburg, Experimentelle Physik II, Am Hubland, 97074 Würzburg — ²Technische Universität Braunschweig, Institut für Physik der Kondensierten Materie, Mendelssohnstraße 3, 38106 Braunschweig — ³Technische Universität Braunschweig, Institut für Mathematische Physik, Mendelssohnstraße 3, 38106 Braunschweig

The transition metal compound FeSi shows unique magnetic and transport properties which have been subject to many theoretical proposals but have never been explained completely. To reveal the electronic band structure we have prepared high quality single crystals with a [100] surface and investigated them with high-resolution ARUPS (Δ E∼3 meV). Close to the Fermi level we see a narrow band with a small dispersion and a strong temperature dependence. We discuss our results in comparison with band structure calculations and with theoretical models involving narrow bands near the edges of the small gap.