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MM: Fachverband Metall- und Materialphysik
MM 4: Liquid and Amorphous Metals I: Fragility and Dynamics of Metallic Glasses
MM 4.1: Vortrag
Montag, 16. März 2015, 10:15–10:30, H 0107
Thermodynamic Properties of Zr- and Au-based Bulk Metallic Glasses at Very Low Temperatures — •Andreas Reifenberger, Daniel Rothfuss, Andreas Fleischmann, Andreas Reiser, and Christian Enss — Kirchhoff-Institut für Physik, Universität Heidelberg, INF 227, 69120 Heidelberg
Many low temperature properties of glasses can be described by the standard tunnelling model. Dielectric glasses and metallic glasses in the superconducting state far below Tc ought to yield similar results since their behaviour is dominated by interactions between tunnelling systems and phonons as electrons condense to cooper pairs. We present measurements of the specific heat and thermal conductivity of superconducting bulk metallic glasses (based on Zr and Au, respectively) in the temperature range from 6 mK to 1 K. We discuss these measurements in the framework of both the BCS-theory of superconductivity and the standard tunnelling model. In the superconducting state close to Tc, where interactions with quasi-particles need to be taken into account, both measurements agree well with BCS-theory predictions. Far below Tc we find good agreements between our data and the standard tunnelling model predictions.