Berlin 2018 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 30: Poster Session: Disordered Quantum Systems

TT 30.4: Poster

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

Thin-film piezoelectric ZnO transducers for studies of tunneling systems in disordered materials with ultrasonic waves — •Axel Gullasch, Saskia M. Meißner, Arnold Seiler, and Georg Weiss — Physikalisches Institut, Karlsruher Institut für Technologie

The ultrasonic pulse propagation technique is a standard method for the study of fundamental properties of solids. Electron-phonon coupling in metals or semiconductors, spin-phonon interactions in magnetic systems as well as phonon coupling to collective excitations and sound propagation effects near phase transitions are a number of applications.

Ultrasonic methods are also an important tool to study atomic tunneling systems (TS) which often dominate the low temperature properties of disordered materials. In superconducting metallic glasses mechanical deformations are the method of choice to study TS and their interaction with conduction electrons.

For all these methods thin film 0.3-1 µm piezoelectric transducers are fabricated to be able to produce acoustic sound waves in the range of 0.5-2 GHz. ZnO is deposited by physical vapor deposition utilizing RF-magnetron sputtering. The quality of our ZnO-films is analyzed with an ultrasonic pulse-echo method using a probe station for lateral scanning of the piezoelectric transducers.