Berlin 2008 – scientific programme
Parts | Days | Selection | Search | Downloads | Help
O: Fachverband Oberflächenphysik
O 50: Symposium: Surface Spectroscopy on Kondo Systems II (Invited Speakers: Jonathan Denlinger, Johann Kroha, Alexander Schneider)
O 50.7: Talk
Wednesday, February 27, 2008, 17:30–17:45, HE 101
Electronic structure of thin ytterbium layers on W(110) — •Yury Dedkov1, Denis Vyalikh1, Matthias Holder1, Martin Weser1, Serguei Molodtsov1, Yury Kucherenko2, Mikhail Fonin3, and Clemens Laubschat1 — 1Institut für Festkörperphysik, TU Dresden, Germany — 2Institute for Metal Physics, Kiev, Ukraine — 3Fachbereich Physik, Universität Konstanz, Germany
Among the lanthanides, Yb and Ce are of fundamental interest, because of the strong interaction between 4f and valence-band (VB) states leading to mixed-valence and Kondo phenomena in a number of compounds [1,2]. This analogy between Yb and Ce systems has been explained on the basis of the electron-hole symmetry of the quasiatomic 4f shell. While the correspondence has been established for a number of compounds, no evidence for such symmetry has been reported up to now for the pure metals. Motivated by the recent work [3], we report on the results of the angle-resolved photoemission (PE) studies of thin layers of Yb (1-3 ML-thick) on W(110) surface. The clear splitting of the Yb 4f7/2 state was observed in the PE spectra measured around Γ point for 1 ML-thick Yb film. The measured PE spectra were analyzed by means of the simplified periodic Anderson model.
[1] C. Laubschat, G. Kaindl, W.-D. Schneider, B. Reihl, and N. Mårtensson, Phys. Rev. B 33, 6675 (1986).
[2] F. Patthey, J.-M. Imer, W.-D. Schneider, H. Beck, Y. Baer, and B. Delley, Phys. Rev. B 42, 8864 (1990).
[3] D. V. Vyalikh, Yu. Kucherenko, S. Danzebächer, Yu. S. Dedkov, C. Laubschat, and S. L. Molodtsov, Phys. Rev. Lett. 96, 026404 (2006).