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 29.4: Vortrag

Dienstag, 26. Februar 2008, 12:45–13:00, HE 101

k- and spin-dependent hybridization effects in Ce monolayer — •Yury Dedkov¹, Denis Vyalikh¹, Mikhail Fonin², Yury Kucherenko³, Serguei Molodtsov¹, and Clemens Laubschat¹ — ¹Institut für Festkörperphysik, TU Dresden, Germany — ²Fachbereich Physik, Universität Konstanz, Germany — ³Institute for Metal Physics, Kiev, Ukraine

Here we present applications of the periodic Anderson model (PAM) to consideration of wave vector (k)- and spin-dependent hybridization effects in Ce metal. It was shown that k-dependent splitting of the 4f ionization peak of Ce/W(110) are correctly described in the framework of the PAM (Coulomb repulsion between two f electrons localized on the same lattice site U_ff→∞). Our results show that the wave vector is conserved upon hybridization. In case of the magnetically ordered Ce monolayer, spin- and angle-resolved resonant photoemission spectra reveal spin-dependent changes of the Fermi-level peak intensities (which reflect the hybridization strength). That indicate a spin-dependence of 4f hybridization and, thus, of 4f occupancy and local moment. The phenomenon was also described in the framework of PAM by 4f electron hopping into the exchange split Fe 3d derived bands that form a spin-gap at the Fermi energy around the Γ point of the surface Brillouin zone.