microwave spectrometer has been constructed to determine the complex conductivity of thin metal films at frequencies from 45 MHz to 20 GHz working in the temperature range from 0.45 K to 2 K (in a 3He cryostat). The setup follows the Corbino approach: a vector network analyzer measures the complex reflection coefficient of a microwave signal hitting the sample as termination of a coaxial transmission line. As the calibration of the setup limits the achievable resolution, we discuss the sources of error hampering different types of calibration. Test measurements of the complex conductivity of a heavy-fermion material demonstrate the applicability of the calibration procedures.
The authors thank Gabriele Untereiner for preparing the calibration and test samples. The UNi2Al3 sample was kindly provided by Martin Jourdan. For constructional advice and support we thank Jürgen Maurer and Günter Dietrich and for the design Elvira Ritz. Financial support by DFG and SFB/TRR21 is acknowledged.
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