Regensburg 2013 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 77: Electronic Structure and Spin-Orbit Interaction III
O 77.4: Vortrag
Donnerstag, 14. März 2013, 16:45–17:00, H33
Angle-Resolved Photoemission on the Kondo Surface Alloy CePd7 — •Mattia Mulazzi1, Christoph Seibel1, Holger Schwab1, Kenya Shimada2, Jiang Jiang2, and Friedrich Reinert1,3 — 1Universität Würzburg, Experimentelle Physik VII, Am Hubland, D-97074 Würzburg, Germany — 2Graduate School of Science, Hiroshima University, Higashi-Hiroshima 739-8526, Japan — 3Karlsruhe Institute of Technology KIT, Gemeinschaftslabor für Nanoanalytik, D-76021 Karlsruhe, Germany
This films of the Cerium were evaporated on a Pd(001) substrate an further annealed to obtain a thin surface alloy layer of stoichiometry CePd7, as observed by Auger spectroscopy. From LEED measurements it was possible to determine that the alloy has a (√5× √5)R26.6∘ reconstruction, commensurate to the Palladium substrate. Photon-energy dependent ARPES measurements crossing the 4d-4f resonance show the presence of a strong peak near the Fermi level, having actually two components, the actual Kondo peak at the Fermi level and the spin-orbit peak at 280 meV binding energy. Resonant and non-resonant Fermi surface maps shows large intensity variations of the Pd bands, when measured at the resonance, a sign of strong hybridization between the conduction and the 4f electrons. While previous work assigns the CePd7 to the class of intermediate valence systems, our work shows that it is actually a Kondo system, with a rather high Kondo temperature.