Measuring the microwave response of superconductors: broadband Corbino and resonant stripline techniques

Marc Scheffler, M. Maximilian Felger, Markus Thiemann, Daniel Hafner, Katrin Schlegel, Martin Dressel, Konstantin S. Ilin, Michael Siegel, Silvia Seiro, Christoph Geibel, Frank Steglich

Abstract

Superconducting materials are of great interest both for the fundamental understanding of electrons in solids as well as for a range of different applications. Studying superconductors with microwaves offers a direct experimental access to the electrodynamic response of these materials, which in turn can reveal fundamental material properties such as the superconducting penetration depth. Here we describe two different techniques to study superconductors at microwave frequencies: the broadband Corbino approach can cover frequencies from the MHz range up to 50 GHz continuously but is limited to thin-film samples whereas the stripline resonators are sensitive enough to study low-loss single crystals but reveal data only at a set of roughly equidistant resonant frequencies. We document the applicability of these two techniques with data taken on an ultrathin TaN film and a single crystal of the heavyfermion superconductor CeCu2Si2, respectively.

Keywords

Microwave spectroscopy, stripline resonators, superconductivity, TaN, CeCu2Si2

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DOI

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IMEKO TC

TC4 - Measurement of Electrical Quantities

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