Dresden 2006 – scientific programme

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MM: Metall- und Materialphysik

MM 25: Poster Session

MM 25.35: Poster

Wednesday, March 29, 2006, 15:30–17:30, P4

Preparation and optical characterisation of yttrium hydride films grown by pulsed laser deposition — •Helge Schröter and Joachim Schoenes — Institut für Physik der Kondensierten Materie, TU Braunschweig Mendelssohnstraße 3, 38106 Braunschweig

It is well known that rare earth metals e.g. yttrium, show a metal isolator transition, if they are exposed to a hydrogen atmosphere. In order to understand the mechanism of the metal isolator transition, we make investigations of layers with different concentrations of hydrogen in yttrium. The layers were manufactured by pulsed laser deposition in a hydrogen atmosphere. By variation of the hydrogen pressure thereby, it is possible to grow layers with different hydrogen concentrations. The change of the optical properties of the samples connected with the metal isolator transition, was examined by transmission spectroscopy and spectroscopic ellipsometry in the energy range between 1 eV and 30 eV. The ellipsometry measurements from 4 eV to 30 eV take place at the VUV/XUV ellipsometer at the BESSY II. To determine the surface finish of the layers, like quantity and dimension of droplets, AFM images of the layer surface were taken.