First critical field measurements of superconducting films by third harmonic analysis

G. Lamura; M. Aurino; A. Andreone; J. C. Villegier

doi:10.1063/1.3211321

paper

First critical field measurements of superconducting films by third harmonic analysis

arXiv:0908.2110 · doi:10.1063/1.3211321

Abstract

The temperature behaviour of the first critical field ( $B_{C 1}$ ) of superconducting thin film samples can be determined with high accuracy using an inductive and contactless method. Driving a sinusoidal current in a single coil placed in front of the sample, a non zero third harmonic voltage $V_{3}$ is induced in it when Abrikosov vortices enter the sample. Conditions to be satisfied for the quantitative evaluation of $B_{C 1}$ using this technique are detailed. As validation test, different type II superconductors (Nb, NbN, MgB $_{2}$ and Y $_{1}$ Ba $_{2}$ Cu $_{3}$ O $_{7 - d}$ under the form of thin films) have been measured. The comparison between experimental results, data presented in literature and theoretical predictions is presented and discussed.

to be published in Journal of Applied Physics

References in corpus (1)

Superconducting properties and Hall Effect of epitaxial NbN thin films

First critical field measurements of superconducting films by third harmonic analysis

Abstract

References in corpus (1)

Cited by in corpus (6)