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DY: Fachverband Dynamik und Statistische Physik

DY 10: Posters I

DY 10.14: Poster

Montag, 14. März 2011, 17:00–19:00, P4

Measurements of the low-frequency elastic properties of dielectric and metallic glasses with double paddle oscillators — •Marius Hempel, Andreas Reiser, Andreas Fleischmann, and Christian Enss — Kirchhoff-Institut für Physik, Im Neuenheimer Feld 227, 69120 Heidelberg

Experimental results of both temperature and frequency dependence of the internal friction and of the change of sound velocity of glasses differ systematically from the predictions of the tunneling model which phenomenologically describes the low temperature properties of glasses. Mutual interaction of the tunneling states which is not incorporated in the tunneling model has been discussed as a possible explanation.

We investigated the elastic properties of the bulk metallic glass Zr₅₅Cu₃₀Al₁₀Ni₅ and of the dielectric optical glass N-KZFS11. The dielectric glass and metallic glass in the superconducting state ought to yield a similar behaviour.

The samples are driven and read out capacitively. They are placed within a solenoid of superconducting niobium-titanium wire providing a magnetic field. The samples feature a double paddle oscillator geometry which exhibits very small background damping due to clamping compared to the vibrating reed method.

The sound velocity and the internal friction at frequencies between 0.5 and 7.5 kHz down to a temperature of 6 mK have been measured. We present experimental results of the different glasses and compare them to theoretical predictions.