Regensburg 2010 – wissenschaftliches Programm
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DY: Fachverband Dynamik und Statistische Physik
DY 30: Posters II
DY 30.14: Poster
Donnerstag, 25. März 2010, 16:00–18:00, Poster C
Measurements of the low-frequency elastic properties of a metallic glass with double paddle oscillators and SQUID based readout — •Marius Hempel, Andreas Reiser, Andreas Fleischmann, and Christian Enss — Kirchhoff-Institut für Physik, Im Neuenheimer Feld 227, 69120 Heidelberg
We investigated the elastic properties of the bulk metallic glass Zr55Cu30Al10Ni5 in the superconducting state.
A double paddle oscillator entirely made of one piece of this bulk metallic glass was fabricated. With this oscillator geometry background damping due to clamping is very small compared to the vibrating reed method. The sample is capacitively driven. A niobium pickup coil micro-fabricated on a silicon chip and connected to the input coil of a SQUID serves as a highly sensitive inductive displacement detector.
We measured the sound velocity and the internal friction at frequencies between 0.5 and 7.5 kHz down to a temperature of 5 mK. We present the experimental results and compare them to theoretical predictions. In particular, the observed temperature dependency of the internal friction is significantly weaker than suggested by the standard tunnelling model, but agrees reasonably well with the behaviour of thin ribbon samples of metallic glasses reported by other authors.