Berlin 2015 – scientific programme
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DY: Fachverband Dynamik und Statistische Physik
DY 61: Poster - Glasses
DY 61.2: Poster
Thursday, March 19, 2015, 16:00–18:00, Poster A
Influence of Atomic Tunneling Systems carrying a Large Nuclear Quadrupole Moment on the Dielectric Properties of Glasses at Very Low Temperatures — •Annina Luck, Nils Hauff, Anne Zeißner, Andreas Fleischmann, Andreas Reiser, and Christian Enss — Kirchhoff-Institut für Physik, Universität Heidelberg, 69120 Heidelberg
Glasses containing significant amounts of isotopes carrying large nuclear electric quadrupole moments show very surprising effects that are not explained by the standard tunneling model. These effects appear in dielectric measurements, both in the low frequency and the microwave regime.
The nucleus of 165Ho carries a very large electric quadrupole and therefore appears to be a good candidate to investigate the influence of atomic tunneling systems carrying a large nuclear quadrupole moment on the dielectric properties of glasses down to very low temperatures. Here, we present measurements of dielectric properties of the multicomponent glass HY-1, containing several percent of holmium. These measurements have been performed in a wide frequency range from 60 Hz to 1 GHz and at temperatures between 7 mK and several Kelvin.
Our measurements show surprising temperature, frequency and electric field strength dependent effects that indicate a non-phonon based thermal relaxation process.