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TT: Fachverband Tiefe Temperaturen

TT 54: Poster Session: Cryotechnique

TT 54.6: Poster

Mittwoch, 22. März 2017, 15:00–19:00, P2-OG3

Development of microstructured superconducting resonators for broadband dielectric measurements of N-BK7 glass between 37 MHz and 1 GHz at low temperatures — •Benedikt Frey, Annina Luck, Andreas Fleischmann, Andreas Reiser, and Christian Enss — Kirchhoff-Institut für Physik, Universität Heidelberg, 69120 Heidelberg

The low temperature behavior of amorphous solids is determined by atomic tunneling systems and can be described by the phenomenological standard tunneling model (STM). Over the years, several experimental results showed significant deviations from this model, which led to a number of modifications of this theoretical description, e.g. an interaction between the tunneling systems.

In order to investigate the dielectric susceptibility of glasses in the MHz to GHz range, microstructured superconducting resonators on glass substrates were designed and fabricated. For the first time, such resonators were used for broadband measurements of the real and imaginary part of the dielectric function of the glass N-BK7 between 37 MHz and 1 GHz . A crossover from a one-phonon to a two-phonon based relaxation was observed in this frequency range, which is in accordance with the STM. In this frequency range, comparing low temperature data to the STM, suggests a modified density of states of tunneling systems in this material.