Dresden 2011 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 79: Electronic structure II
O 79.3: Vortrag
Donnerstag, 17. März 2011, 15:30–15:45, WIL C107
Fermi Surface Mapping and Heavy Hermion Behaviour in ARPES on CePt5 and CeAg5 Surface Alloys — •Holger Schwab1, Markus Klein1, Andreas Nuber1, Johannes Ziroff1, H. Hayashi2, Jian Jiang2, Kenya Shimada3, Mattia Mulazzi1, F.F. Assaad4, and Friedrich Reinert1 — 1Universität Würzburg, Experimentelle Physik VII, Am Hubland, D-97074 Würzburg, Germany — 2Graduate School of Science, Hiroshima University, Higashi-Hiroshima 739-8526, Japan — 3Hiroshima Synchrotron Radiation Center, Hiroshima University, Higashi-Hiroshima 739-0046, Japan — 4Universität Würzburg, Institut für Theoretische Physik und Astrophysik, Am Hubland, D-97074 Würzburg, Germany
Using high-resolution angle-resolved photoemission we studied ordered Cerium surface alloys on Pt(111) and Ag(111) surfaces. We present light polarization dependent bandstructure and Fermi surfaces for several photon energies including Ce 4d-4f resonant photoemission. In the CePt5 surface alloy, we show the temperature dependence of the Cerium 4f electron spectral weight near the Fermi level. There we observed the opening of a hybridisation gap between the flat 4f Cerium band and one strongly dispersing Pt conduction band that has a strong temperature dependence. The comparison to LDA+DMFT calculations based on an NCA solver shows the on-set of the coherent heavy fermion state at low temperature below the Kondo temperature of the material.