Berlin 2008 – scientific programme

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DS: Fachverband Dünne Schichten

DS 32: Metal and Amorphous Layers

DS 32.1: Talk

Thursday, February 28, 2008, 13:15–13:30, H 2032

Electronic structure of ultrathin lead films — •Yvonne Käsler, Andreas Nuber, Frank Forster, and Friedrich Reinert — Universität Würzburg, Experimentelle Physik II, 97074 Würzburg

We have prepared ultrathin lead films on a Si(111)−(7×7) surface using a low temperature growth method, which is necessary to mitigate the problem of a large lattice mismatch and a different chemical bonding of the metal film and the semiconductor. Using high resolution photoelectron spectroscopy we focussed on the observation of quantum well states (QWS) of different film thicknesses. As the formation of QWSs greatly modulates the electronic structure near the Fermi level it has been speculated before that a lot of other properties are modulated as well. One of these is superconductivity. We measured the QWSs at different thicknesses and temperatures, determined the linewidths, and thus we were able to calculate electron-phonon coupling parameters and transition temperatures in dependence of the overlayer thickness. We were able to observe deviations from the bulk values of these parameters.