Berlin 2005 – wissenschaftliches Programm

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O: Oberflächenphysik

O 36: Postersitzung (Elektronische Struktur, Grenzfl
äche fest-flüssig, Halbleiteroberfl
ächen und -grenzfl
ächen, Nanostrukturen, Oberfl
ächenreaktionen, Teilchen und Cluster, Struktur und Dynamik reiner Oberfl
ächen)

O 36.9: Poster

Montag, 7. März 2005, 15:00–18:00, Poster TU F

Electronic properties of Fe_xTiS₂ (x=0.0, 0.1, 0.33, 0.66) — •Meike Quitzau, Magnus Garbrecht, Kai Rossnagel, and Lutz Kipp — Institut für Experimentelle und Angewandte Physik, Universität Kiel, D-24098, Germany

The electronic properties of the sandwich-layered transition metal dichalcogenide TiS₂ and its intercalation compounds Fe_xTiS₂ (x=0.1, 0.33, 0.66) have been investigated by angle-resolved photoelectron spectroscopy, resistivity measurements, LEED, and STM. While the resistivity measurements confirm magnetic phase transitions at different temperatures as a function of x, no superlatice induced by the iron could be found in the LEED and STM patterns, indicating that there is no long-range order in the distribution of the guest atoms at the surface. The ARPES data show new electronic states just below the Fermi level that appear as two bands with almost no dispersion in Γ M and Γ K directions. An opening of a hybridization gap for increasing x between the highest S 3p-band at the Γ (A) point and the lowest Ti 3d-band at the M (L) point is observed.

The work is supported by DFG Forschergruppe FOR 353.