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 29.3: Hauptvortrag (ohne Erstattung)

Dienstag, 26. Februar 2008, 12:15–12:45, HE 101

ARPES Study of Hybridization Phenomena in Heavy-Fermion Lanthanide Compounds — •Serguei Molodtsov — Dresden University of Technology, Germany

High-resolution angle-resolved photoemission spectra of various heavy-fermion Ce and Yb systems reveal strong momentum (k) dependent splittings of the 4f signals around the expected intersection points of the 4f final states with valence bands in the Brillouin zone [1]. The obtained dispersion of the interacting 4f states both in the region of the Fermi level and at higher binding energies is explained in terms of a simplified periodic Anderson model by a k dependence of the electron hopping matrix element disregarding clearly interpretation in terms of the single-impurity Anderson model for single-crystalline samples. The obtained data show that the heavy-fermion behavior depends crucially on properties of the electronic bands not necessarily located in the immediate vicinity of the Fermi energy.

[1]. S. Danzenbaecher et al. Phys. Rev. B 72 (2005) 033104; Phys. Rev. Lett. 96 (2006) 106402; D.V. Vyalikh et al. Phys. Rev. Lett. 96 (2006) 026404; Phys. Rev. Lett. (2007), accepted.