Measurements of surface impedance of superconductors as a function of frequency in microwave range

TL;DR

This paper presents microwave frequency measurements of the complex resistivity in YBCO and MgB$_2$ thin films, analyzing the data to understand the frequency-dependent behavior of their superconducting transitions.

Contribution

It introduces a detailed data analysis method for extracting resistivity from microwave measurements and explores the frequency dependence of superconducting transitions in thin films.

Findings

Resistivity curves as a function of frequency and temperature are obtained.

Superconducting transition widens with increasing frequency.

Data analysis procedure's limits of validity are discussed.

Abstract

We report measurements of the complex resistivity in YBCO and MgB$_2$ thin films over a continuous frequency spectrum in the microwave range, making use of a Corbino disk geometry. The paper mainly focuses on the extraction of the resistivity from raw data, displaying data analysis procedure and its limits of validity. We obtain and show resistivity curves as a function of frequency and temperature denoting a frequency dependent widening of the superconducting transition.