Dresden 2020 – wissenschaftliches Programm
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O 100.5: Vortrag
Donnerstag, 19. März 2020, 11:30–11:45, REC C 213
Layer thickness dependence of the electronic correlation in the surface alloy CeAgx on Ag(111) — •Katharina Kissner, Hendrik Bostelmann-Arp, and Friedrich T. Reinert — Experimentelle Phyik VII, Universität Würzburg
Ce-based compounds present a role model for the investigation of electronic correlation. At low temperatures the local interaction of conduction band electrons with the single 4f-electron provided by Ce leads to distinct features in the electronic structure in CeAgx on Ag(111). These features appear in the valence band electronic structure in terms of the Kondo resonance, its spin orbit partner and the 4f-ionization peak, as well as in the Ce 3d-core levels. The appearance of Kondo physics strongly depends on the local environment of the Ce ion in the lattice and can therefore be modified by varying the alloy film thickness or by doping with different adatoms [1, 2].
In this study we investigate the electronic structure and stoichiometry of different surface alloy film thicknesses of CeAgx on Ag(111) by means of Angle Resolved and X-Ray Photoelectron Spectroscopy (ARPES and XPS). Furthermore we study the surface lattice structure by Low Energy Electron Diffraction and Scanning Tunneling Microscopy (LEED and STM). This provides us with the opportunity to tune the strength of the electronic correlation in CeAgx on Ag(111).  H. Schwab, Phys. Rev. B, 85, 2012;  C. Praetorius et al., Phys. Rev. B 92, 045116, (2015)