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Regensburg 2010 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 41: Poster Session I (Semiconductor Substrates: Epitaxy and growth; Semiconductor Substrates: Adsorbtion; Semiconductor Substrates: Solid-liquid interfaces; Semiconductor Substrates: Clean surfaces; Oxides and insulators: Epitaxy and growth; Oxides and insulators: Adsorption; Oxides and insulators: Clean surfaces; Organic, polymeric and biomolecular films - also with adsorbates; Organic electronics and photovoltaics, Surface chemical reactions; Heterogeneous catalysis; Phase transitions; Particles and clusters; Surface dynamics; Surface or interface magnetism; Electron and spin dynamics; Spin-Orbit Interaction at Surfaces; Electronic structure; Nanotribology; Solid/liquid interfaces; Graphene; Others)

O 41.84: Poster

Dienstag, 23. März 2010, 18:30–21:00, Poster B1

Electronic structure of LaAg5 alloy films on Ag(111) — •Christoph Seibel1, Hendrik Bentmann1, Luca Moreschini2, Gustav Bihlmayer3, Frank Forster1, and Friedrich Reinert1,41Universität Würzburg, Experimentelle Physik VII, Am Hubland, D-97074 Würzburg, Germany — 2Ecole Polytechnique Fédérale de Lausanne (EPFL), Institut de Physique des Nanostructures, CH-1015 Lausanne, Switzerland — 3Institut für Festkörperforschung, Forschungszentrum Jülich, D-52425 Jülich, Germany — 4Forschungszentrum Karlsruhe, Gemeinschaftslabor für Nanoanalytik, D-76021 Karlsruhe, Germany

We have characterized the growth of La on Ag(111) by UPS, XPS and LEED. At La coverages of about 4 ML or higher and subsequent annealing we observe an ordered (2x2) surface structure that is rotated by 30 with respect to the substrate. In analogy to the well-studied system CePt5, we identify our system as a LaAg5 alloy in a CaCu5-type structure.

Employing angle-resolved photoelectron spectroscopy (ARPES) we measured the band structure along high symmetry lines and the Fermi surface (FS) of the LaAg5 films. We find several sharp bands near the Fermi level and a high anisotropy in the FS. Our results are compared to ARPES results on CePt5 and LaPt5 as well as first-principles calculations. The system shall serve as a reference for iso-structural alloys composed of other lanthanoids, such as Ce or Gd, potentially showing Kondo physics or other magnetic effects.

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