info:eu-repo/semantics/article
In situ comparison of the critical current density in YBa2Cu3O7− thin films measured by the screening technique under two criteria
Autor
JOSE ANDRES MATUTES AQUINO
Resumen
In this investigation we report the determination of the critical current
density Jc flowing in a YBa2Cu3O7−S superconducting thin film. Estimation of
Jc was carried out by an inductive technique, the so-called screening technique, in
which both the imaginary part of the fundamental harmonic of susceptibility Xi′
1 and
third harmonic voltage V3 criteria were considered for the determination of the full
penetration field. In order to verify the reliability of this technique under two criteria,
we investigated the homogeneity of Jc via transport measurements conducted on four
microbridges patterned in the same film. Based on the transport method we found
that both techniques yield similar results in the determination of Jc for temperatures
close to critical temperature Tc. However, at temperatures relatively far from Tc, the
V3 criterion showed a better agreement with the transport data. Furthermore, using
both criteria, we propose a methodology to estimate in situ the coil factor associated
with the V3 criterion, avoiding in this way the need of implementing an additional
technique.
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