Dresden 2014 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 39: Liquid and Amorphous Metals I - Shearbands

MM 39.4: Vortrag

Mittwoch, 2. April 2014, 11:00–11:15, IFW A

Elastic Susceptibility measurements of Zr-based Bulk Metallic Glass at Ultra Low Temperatures — •Marius Hempel, Andreas Reiser, Andreas Fleischmann, and Christian Enss — Kirchhoff-Institut für Physik, Im Neuenheimer Feld 227, 69120 Heidelberg

Many low temperature properties of glasses can be described by the standard tunnelling model. Dielectric and metallic glasses in the superconducting state far below T_C ought to yield similar results since their behaviour is solely governed by interactions between tunnelling systems and phonons in the absence of conduction electrons. We present experimental results of both temperature and frequency dependence of the internal friction and sound velocity of the bulk metallic glass Zr₅₅Cu₃₀Al₁₀Ni₅ which differ systematically from predictions. In particular, the observed temperature dependency of the internal friction is significantly weaker than predicted by the standard tunnelling model, but agrees reasonably well with the behaviour of thin ribbon samples of metallic glasses reported by other authors.