First critical field measurements of superconducting films by third harmonic analysis

Details First critical field measurements of superconducting films by third harmonic analysis First critical field measurements of superconducting films by third harmonic analysis

2009-08-14

arxiv.org/abs/0908.2110v1

Physics

Condensed Matter

Superconductivity

to be published in Journal of Applied Physics

Scientific paper

The temperature behaviour of the first critical field ($B_{C1}$) 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 $B_{C1}$ 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.

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