Nb 3 Sn is a superconductor of great relevance for perspective radiofrequency (RF) applications. We present for the first time surface impedance (Z s ) measurements at 15 GHz and low-RF field amplitude on Nb 3 Sn in high magnetic fields up to 12 T, with the aim of increasing the knowledge of Nb 3 Sn behavior in such conditions. Z s is a fundamental material parameter that directly gives useful information about the dissipative and reactive phenomena when the superconductor is subjected to high-frequency excitations. Therefore, we present an analysis of the measured Z s with the aim of extracting interesting data about pinning in Nb 3 Sn at high frequencies. From Z s , we extract the vortex motion complex resistivity to obtain the r-parameter and the depinning frequency p in high magnetic fields. The comparison of the results with the literature shows that the measured nu p on bulk Nb 3 Sn is several times greater than that of pure Nb. This demonstrates how Nb 3 Sn can be a good candidate for RF technological applications, also in high magnetic fields.

Surface Impedance Measurements on Nb 3 Sn in High Magnetic Fields

Muzzi L.;
2019

Abstract

Nb 3 Sn is a superconductor of great relevance for perspective radiofrequency (RF) applications. We present for the first time surface impedance (Z s ) measurements at 15 GHz and low-RF field amplitude on Nb 3 Sn in high magnetic fields up to 12 T, with the aim of increasing the knowledge of Nb 3 Sn behavior in such conditions. Z s is a fundamental material parameter that directly gives useful information about the dissipative and reactive phenomena when the superconductor is subjected to high-frequency excitations. Therefore, we present an analysis of the measured Z s with the aim of extracting interesting data about pinning in Nb 3 Sn at high frequencies. From Z s , we extract the vortex motion complex resistivity to obtain the r-parameter and the depinning frequency p in high magnetic fields. The comparison of the results with the literature shows that the measured nu p on bulk Nb 3 Sn is several times greater than that of pure Nb. This demonstrates how Nb 3 Sn can be a good candidate for RF technological applications, also in high magnetic fields.
depinning frequency; High magnetic fields; microwave; Nb3Sn; surface impedance
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/20.500.12079/53889
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