| Autor: |
Gamboa, F., Perez, I., Matutes-Aquino, J. A., Moewes, A., Sosa, Victor |
| Předmět: |
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| Zdroj: |
IEEE Transactions on Applied Superconductivity; Feb2015, Vol. 25 Issue 1, p1-5, 5p |
| Abstrakt: |
We report the determination of critical current density Jc flowing in YBa2Cu3O7-δ superconducting thin films by two independent criteria. The estimation of Jc was carried out by an inductive technique, i.e., the so-called screening technique. Both the imaginary part of the fundamental harmonic of susceptibility χ1" and the third harmonic of the voltage V3 criteria were used to determine the full penetration field. Our goal is to shed light on the selection of the criterion for the determination of Jc. In order to compare the inductive criteria, we investigated the homogeneity of Jc via transport measurements conducted on microbridges patterned in the films. Based on the transport method, we found that, for temperatures close to critical temperature Tc, both techniques yield similar results in the determination of Jc. However, at temperatures relatively far from Tc, the V3 criterion showed better agreement with the transport data. Furthermore, using both criteria, we propose an alternative methodology to estimate in situ the coil factor associated with the V3 criterion, avoiding in this way the need for implementing an additional technique. [ABSTRACT FROM PUBLISHER] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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