Berlin 2018 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 30: Poster Session: Disordered Quantum Systems

TT 30.6: Poster

Montag, 12. März 2018, 15:00–19:00, Poster B

Influence of Nuclear Quadrupole Moments on Dielectric Polarization Echoes — •Andreas Schaller, Marcel Haas, Robert Haase, Anna Pollithy, Sergey Tsurkan, Matthias Sinnwell, Andreas Fleischmann, Andreas Reiser, and Christian Enss — Kirchhoff-Institute for Physics, Heidelberg University, D-69120 Heidelberg

Many low temperature properties of amorphous solids are well described by the phenomenological standard tunneling model. However, measurements of the dielectric constant, sound velocity, and dielectric polarization echoes of glasses containing atoms carrying nuclear quadrupole moments revealed unexpected characteristics, such as magnetic field dependencies, which are not observed in glasses without nuclear quadrupole moments.

We present new results of dielectric two-pulse polarization echo measurements carried out on different multicomponent glasses and polymers containing large nuclear quadrupole moments. For all these samples the two-pulse-echo decay occurs on a comparably short timescale and we observe a dependency of the echo amplitude on the electric field strength of the excitation pulses which is weaker than for glasses without large nuclear quadrupole moments. In order to probe the echo decay at sub-μs times we developed microstructured superconducting planar resonators for which the quality factor can be determined by design. We show the results of first test measurements.