Dresden 2017 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 55: Poster Session: Superconductivity 2
TT 55.7: Poster
Mittwoch, 22. März 2017, 15:00–19:00, P2-OG3
Broadband acoustic measurements on the metallic glass Zr59Ti3Cu20Ni8Al10 — •Alexander Prieschl, Sebastian Eisenhardt, Markus Döttling, Saskia Meißner, Arnold Seiler, and Georg Weiss — Physikalisches Institut, KIT Karlsruhe
Atomic two-level tunneling systems (TS) dominate the properties of disordered solids at low temperatures. While the standard tunneling model successfully describes thermodynamic properties of insulating glasses, it fails to predict the elastic properties of metallic glasses correctly. To explore the influence of conduction electrons on the density of states and the dynamics of TS ultrasonic experiments are performed. In superconducting glasses the interaction can be switched on and off by means of a magnetic field which suppresses superconductivity and therefore enables electrons to interact with TS.
Here we present measurements of the internal friction and the sound velocity of the superconducting bulk metallic glass Zr59Ti3Cu20Ni8Al10 from 10 mK to room temperature. Low frequency acoustic measurements at 1 kHz are performed by using the vibrating reed technique, whereas frequencies up to 2 GHz are obtained by thin film piezoelectric transducers.