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Dresden 2009 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 35: Poster Session II

MM 35.5: Poster

Mittwoch, 25. März 2009, 16:30–18:30, P4

Hybridization Phenomena in the Nearly Half-Filled f Shell Electron System EuNi2P2 — •Steffen Danzenbächer1, Denis Vyalikh1, Yuri Kucherenko2, Cornelius Krellner3, Christoph Geibel3, Serguei Molodtsov1, and Clemens Laubschat11Institut für Festkörperphysik, Technische Universität Dresden, D-01062 Dresden, Germany — 2Institute of Metal Physics, National Academy of Sciences of Ukraine, UA-03142 Kiev, Ukraine — 3Max-Planck-Institut für Chemische Physik fester Stoffe, Nöthnitzer Strasse 40, D-01187 Dresden, Germany

In this contribution we present high resolution angle-resolved photoemission data of the mixed-valent compound EuNi2P2 that are complimented with band-structure calculations. The study focuses on the behavior of the 4f6 final state close to the Fermi energy. Apart from the 7FJ multiplet splitting as expected for an atomic-like state, this state exhibits additional splittings and dispersions like a valence state. The data are properly reproduced within a calculation that describes the interaction between the 4f and valence-band states in the framework of a simplified periodic Anderson model (PAM). The model starts from atomic-like multiplets and considers hopping-interaction to valence-band states. The strength of the interaction of the valence band with 4f states depends on band energy, symmetry and partial f character of the valence band states that vary across the Brillouin zone (BZ). Particulary strong interactions between individual terms of the f multiplets and parabolic bands were experimentally found in good agreement with our theory at different points of the surface BZ.

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