Berlin 2012 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 77: Electronic structure I
O 77.5: Vortrag
Donnerstag, 29. März 2012, 17:00–17:15, MA 043
Character of the valence band states in the Kondo surface alloys CeAgx/Ag(111) and CePt5/Pt(111) — •Holger Schwab1,2, Mattia Mulazzi1,2, Kenya Shimada3, and Friedrich Reinert1,2 — 1Physikalisches Institut, Experimentelle Physik VII und Wilhelm Conrad Röntgen Research Center for Complex Material Systems (RCCM), Universität Würzburg, D-97074 Würzburg — 2Gemeinschaftslabor für Nanoanalytik, Karlsruher Institut für Technologie KIT, D-76021 Karlsruhe — 3Hiroshima Synchrotron Radiation Center, Hiroshima University, Higashi-Hiroshima 739-0046, Japan
Recently we have shown the transition from the single impurity to the Kondo lattice regime in the surface alloy CePt5. [1] Now we have prepared a new Ce based surface alloy: CeAgx. The electronic and crystal structures of both materials have been investigated by means of low-energy electron diffraction and angle-resolved photoelectron spectroscopy (ARPES). With resonant PES near the 4d-4f absorption edge we were able to infer the weight of the 4f-electron spectral function with respect to single-particle density of states. While the typical Kondo features at the Fermi energy (Kondo resonance and spin orbit partner) in the CePt5 surface alloy are observed, CeAgx shows a different behaviour. By comparing our experiments to model calculations [2,3], we were able to estimate the Kondo temperature in the two systems and investigate parameters contributing to the hybridisation.
[1] M. Klein et al.,Phys. Rev. Lett. 106, 186407 (2011).
[2] F. Patthey et al., Phys. Rev. B 42, 8864 (1990).
[3] S. Gardonio et al., Phys. Rev. Lett. 107, 026801 (2011).