Microwave measurements to assess the properties of superconducting materials for applications

Enrico Silva, Nicola Pompeo, Kostiantyn Torokhtii

Abstract

Establishing with minimum effort the performances of coated conductors (superconductingbased tapes) in terms of maximum current density is a crucial issue in the optimization of the superconducting material. Methods with minimum requirements in terms of sample preparation (nondestructive) are maximally sought. In this work we review the potential of a contactless microwave technique based on the use of resonators. The technique exploits the intrinsic processes at the heart of the dissipation of a superconductor in order to assess a first, go/no-go quality test for the superconducting material. We discuss the limitations and the advantages of the proposed method as well as the requirements for the microwave setup. Finally, we compare the microwave results to the directly measured dc features of several superconducting samples of interest for coated conductors.

Keywords

Superconductors; Critical current density; Surface impedance; Coated conductors; Vortex motion

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IMEKO-TC4-2014-263.pdf

DOI

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IMEKO TC

TC4 - Measurement of Electrical Quantities

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