Dresden 2009 – wissenschaftliches Programm

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DS: Fachverband Dünne Schichten

DS 17: Layer Properties: Electrical, Optical and Mechanical Properties I

DS 17.6: Vortrag

Mittwoch, 25. März 2009, 10:45–11:00, GER 37

Conductivity of nanocrystalline chromium from infrared spectra — •Robert Lovrincic and Annemarie Pucci — Kirchhoff-Institut für Physik der Universität Heidelberg

During the growth of Cr on diamond C(100) a structural phase transition from a disordered phase to the crystalline bulk phase is observed. The nature of the phase transition is clarified by analysing thickness dependent infrared transmittance spectra with a Drude-Smith type dielectric function. In particular, there is an evident memory effect in the electronic collisions below a critical thickness of 2.5 nm and a clear Drude-type behaviour above that thickness. The thickness of that phase transition well agrees with the predicted maximum diameter value for stable fcc Cr nanoclusters. It is hence concluded that a phase transition from fcc nanoclusters to the bulk bcc phase is the origin of the observed spectral behaviour.

Supported by EC Integrated Infrastructure Initiative Hadron Physics, Project RII3-CT-2004-506078 and the Gesellschaft für Schwerionenforschung, Darmstadt.