Dresden 2020 – wissenschaftliches Programm
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TT 16.4: Poster
Montag, 16. März 2020, 15:00–19:00, P2/EG
Probing the dielectric properties of disordered thin-films with microwave resonators — •Nikolaj Ebensperger1, Benjamin Sacépé2, Martin Dressel1, and Marc Scheffler1 — 11. Physikalisches Institut, Universität Stuttgart, Germany — 2Institut Néel, CNRS Grenoble, France
Weakly superconducting materials are of high interest for a multitude of recent studies. Yet probing the fundamental properties of these often highly disordered or granular materials is challenging and experiments are not easily performed. Specifically the insulating state terminating superconductivity in highly disordered amorphous indium oxide poses various theoretical and experimental challenges. A body of work indeed showed that the charge carriers in it are localized Cooper pairs. The electrodynamic response in this regime can offer important insight, but it is difficult to probe. In this study we present measurements of the dielectric properties of very highly disordered, insulating indium oxide films. We detail the experimental design of our microwave-resonator device as a discrete frequency probe in the GHz-range up to 20 GHz in an operable temperature range down to mK temperatures. Additionally we apply this method to a variety of different insulating/dielectric films with varying thickness and compare to simulations and theory .
 Rev. Sci. Instr. 90, 114701 (2019)