Berlin 2008 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 11: Glasses I (joint session DF/DY)

DY 11.4: Vortrag

Dienstag, 26. Februar 2008, 10:30–10:45, EB 407

Dielectric polarization noise near the glass transition — •Sandra Jenewein, Andreas Fleischmann, Gernot Kasper, Andreas Reiser, and Christian Enss — Kirchhoff-Institut für Physik, Universität Heidelberg, Im Neuenheimer Feld 227, 69120 Heidelberg

Dielectric polarization noise can reveal fundamental information on relaxation processes in glass forming liquids or glasses. We measured the voltage and current noise spectral density in the organic glass former tri-propylene glycol in the vicinity of the glass transition. A home built electrometer amplifier was used to measure the voltage fluctuations of a capacitor filled with the sample. Using a custom built current-to-voltage converter we measured the current fluctuations of the sample. From the noise spectra we determined the dynamic glass transition. Using the fluctuation-dissipation theorem a comparison to frequency domain dielectric spectroscopy will be given.