Regensburg 2007 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 44: Poster Session II (Semiconductors; Oxides and Insulators: Adsorption, Clean Surfaces, Epitaxy and Growth; Surface Chemical Reactions and Heterogeneous Catalysis; Surface or Interface Magnetism; Solid-Liquid Interfaces; Organic, Polymeric, Biomolecular Films; Particles and Clusters; Methods: Atomic and Electronic Structure; Time-resolved Spectroscopies)

O 44.44: Poster

Mittwoch, 28. März 2007, 17:00–19:30, Poster C

Matrix-Element Effects in Valence-Band Photoemission of Fe_xTiS₂ using Circularly Polarized Light — •Martin Marczynski-Bühlow¹, Sabrina Lang¹, Jens Buck¹, Kai Roßnagel¹, Lutz Kipp¹, Nathaniel Janke-Gilman², Andrew Walter², and John Riley² — ¹Institut für Experimentelle und Angewandte Physik, Universität Kiel, D-24098, Germany — ²Physics Department, La Trobe University, Melbourne, Australia

The effect of iron intercalation on the structural, magnetic and electronic properties of the layered transition metal dichalcogenide TiS₂ is an interesting and extensively studied question.

We investigated the valence band structure of Fe_xTiS₂ (x = 0; 0.1; 0.33) by angle-resolved photoemission taking advantage of a second generation toroidal electron spectrometer with fast data acquisition. Particularly, we have studied whether and to what extent Fe intercalation leads to modifications of the host valence band structure, such as increased band filling, hybridization between the Fe 3d orbitals and the host Ti 3d and S 3p orbitals, or new Fe 3d-derived electronic states below the Fermi energy.

Our main aim in this work was to reveal possible spin polarization effects at the Fermi energy by using fully circularly polarized light from beamline U56/2-PGM1 (hν = 89 to 1328 eV) at BESSY. Although we were not able to answer the question concerning spin polarization, interesting matrix-element effects were observed for the iron intercalated as well as for the pristine TiS₂ compound.

This work is supported by the DFG Forschergruppe 353.