Berlin 2008 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 29: Symposium: Surface Spectroscopy on Kondo Systems I (Invited Speakers: Wolf-Dieter Schneider, Fakher Assaad, Serguei Molodtsov)

O 29.5: Vortrag

Dienstag, 26. Februar 2008, 13:00–13:15, HE 101

High-Resolution Photoemission Spectroscopy on an Ordered Pt₅Ce Surface Alloy: Kondo-Resonance, Band Structure and Fermi Surface — •Christina Albers¹, Markus Klein¹, Kevin Beach², Fakher Assaad², and Friedrich Reinert¹ — ¹Universität Würzburg, Experimentelle Physik II, 97074 Würzburg — ²Universität Würzburg, Theoretische Physik I, 97074 Würzburg

We present a detailed investigation of the electronic structure of an ordered Pt₅Ce-film by means of angular resolved ultraviolet photoemission spectroscopy (ARUPS). An in situ prepared, ordered Pt₅Ce surface alloy, consisting of alternating layers of Pt₂Ce and kagome-nets of Pt, forms stable and reproduceable films on the Pt substrate. We investigated in detail the 4f Kondo resonance, other renormalization effects on the k-dependent band structure, and the temperature-dependence of the spectral features. In particular we studied the 4f-states by a comparison of the data on Pt₅Ce and Pt₅La. The experimental results will be discussed together with DMFT calculations.