Regensburg 2016 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 28: Poster - Complex Fluids, Granular Matter, Glasses

DY 28.14: Poster

Dienstag, 8. März 2016, 18:15–21:00, Poster C

Novel LC-resonator techniques for measurements of MHz dielectric properties of glasses at very low temperatures — •Benedikt Frey, Wiebke Scholz, Guido Homann, Anne Zeissner, Annina Luck, Andreas Fleischmann, Andreas Reiser, and Christian Enss — Kirchhoff-Institut für Physik, Universität Heidelberg, 69120 Heidelberg

Many properties of amorphous solids at low temperatures can be explained with the standard tunneling model, which is based on two level-tunneling systems. Significant deviations from the standard tunneling model were observed in dielectric measurements, both in the kHz and in the GHz regime. Moreover these measurements show a strongly frequency dependent behaviour that indicate a non-phonon based thermal relaxation process.
For further investigations of the crossover into this relaxation process, we have developed novel LC-resonator based measurement setups for the MHz regime. Our current setup operating at 30 MHz allows measurements with both very low field strengths and ultra low input power, while its high quality factor also permits a determination of the dielectric loss factor.
Measurements performed on the samples HY-1, N-BK7, Herasil and PVAc show the influence of nuclear quadrupoles and long range interactions on dielectric properties of glasses in this frequency regime.