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Determination of the Superconducting Penetration Depth From Coplanar-Waveguide Measurements



Kenneth Leong, James C. Booth, John H. Claassen


We introduce a novel transmission line method for measurements of the penetration depth of thin high temperature supervonducting (HTS) films. The method is based on the accurate extraction of the inductance-per-unit-length of a superconducting coplanar wave-guide (CPW) transmission line fabricated on teh HTS sample. Using the experimentally obtained inductance per unit lenght, we interpolate the penetration depth from a table of numerically-calculated inductance (per unit length) values as a function of penetration depth. A novelty of our procedure is the utilization of the Multiline TRL Method and the Calibration Comparison Method to accurately determine the inductance per unit length of the superconducting transmission line. By measuring different CPW geometries patterned onto the same chip, we can verify our penetration depth values. We demonstrate this technique by extraction the penetration depth for several different HTS films at 76K, and estimate relevant uncertainties.
Journal of Superconductivity


Penetration depth, transmission line resonator, coplanar waveguide, microwave measurements.


Leong, K. , Booth, J. and Claassen, J. (2006), Determination of the Superconducting Penetration Depth From Coplanar-Waveguide Measurements, Journal of Superconductivity, [online], (Accessed April 12, 2024)
Created November 1, 2006, Updated January 27, 2020