Abstract
Time-domain Terahertz transmission spectroscopy (TDTTS) has proved to be a unique method for the experimental study of electromagnetic properties of high temperature superconducting thin-films at THz-frequencies in basic and applied research. We have improved the analysis of TDTTS-measurements by numerically extracting the complex index of refraction from the measured complex transmission of the superconducting thin film. Based on this other important figures as surface resistance and dielectric function are derived. We have applied this method to study the surface resistance and the dielectric function of YBa 2Cu 3O x thin films between 10K and 120K in the frequency range between 0.15THz and 2.4THz. The temperature and frequency dependence of our surface resistance data is successfully explained by a weak coupling model of d-wave superconductivity which incorporates inelastic and elastic scattering at temperatures above 50K. At lower temperatures a deviation of the experimental data from theory is observed which is due to a resonance of the dielectric function.
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