Regensburg 2010 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 9: SC: Poster Session

TT 9.60: Poster

Montag, 22. März 2010, 14:00–18:00, Poster A

Inductance of thin metal strips in broadband Corbino microwave spectroscopy — •Katrin Steinberg, Marc Scheffler, and Martin Dressel — 1. Physikalisches Institut, Universität Stuttgart, Stuttgart, Germany

Broadband microwave spectroscopy is a emerging technique to study the electronic properties of different materials in a huge range of frequency. Using a Corbino setup, where the sample is pressed against an open end of a coaxial cable, we investigate a broad range of samples from semiconducting crystals to metallic or superconducting thin films. To increase the measurement sensitivity for the metallic and superconducting samples, one can use a strip-shaped sample geometry instead of samples covering the complete Corbino probe. This geometry increases sample impedance but also leads to additional effects in the measured sample impedance, which have to be taken into account. We present the analysis of the strip-shaped film inductance for different geometric film parameters like thickness, width and length. The frequency and temperature dependence of these effects was investigated for different materials. We compare the theoretical predictions with our experimental data covering a broad frequency range (45 MHz - 40 GHz) and varying sample geometries and materials, including metals and superconductors at temperatures between 1 K and 300 K. Our results apply to conductive strips at microwave frequencies in general.