Apparatus for measurement of surface resistance versus rf magnetic field of high-T c superconductors

1 August 1990

journal article
Published by AIP Publishing in Review of Scientific Instruments

Vol. 61 (8) , 2207-2210
https://doi.org/10.1063/1.1141390

Abstract

A coaxial niobium quarter-wave resonant cavity has been fabricated and used for measurement of the surface resistance of disk-shaped samples of high-Tc superconductors at 820 MHz and 4.2 K, and at surface rf magnetic fields ranging to 300 G. The cavity can accommodate samples as large as 36 mm in diameter. A measurement procedure has been developed with which rf surface resistances less than 20 μΩ can be resolved for a 24-mm-diam sample at 820 MHz. This cavity is useful in determining the suitability of high-Tc superconductors for high-power rf applications.

Keywords

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