Effect of kinetic inductance on current–voltage characteristics of YBa2Cu3O7−x grain boundary junctions
| Autor: | F. Sánchez-Quesada, M.A. Navacerrada, M. L. Lucía |
|---|---|
| Rok vydání: | 2002 |
| Předmět: |
Superconductivity
Josephson effect Materials science Condensed matter physics Annealing (metallurgy) Energy Engineering and Power Technology chemistry.chemical_element Condensed Matter Physics Kinetic inductance Electronic Optical and Magnetic Materials Inductance chemistry Grain boundary Electrical and Electronic Engineering Penetration depth Helium |
| Zdroj: | Physica C: Superconductivity. :83-86 |
| ISSN: | 0921-4534 |
| DOI: | 10.1016/s0921-4534(02)00813-4 |
| Popis: | Among the different models proposed to describe YBa 2 Cu 3 O 7− x (YBCO) grain boundary Josephson junctions (GBJJs), the filamentary model is consistent with a wide set of experimental results. However, because of the large magnetic penetration depth ( λ L ) of YBCO, the kinetic inductance ( L K ) associated to the superconducting filaments must be taken into account in order to explain some of these results. In this line, we have previously proposed a model considering inductance effects to analyze the dielectric response of the barrier. From the point of view of transport, we find that current–voltage (I–V) curves of YBCO junctions made on bicrystal with junction width (w) higher that 8 μ m do not fit to a resistively shunted junction (RSJ) model. We believe that besides structural inhomogeneities of the barrier, L K associated to the superconducting filaments in GBJJs is responsible for such a result. In this sense, experimental I–V curves can be properly fitted if an inductive term is added to the RSJ model. Our results for GBJJs with w ranging between 8 and 50 μm show that L K increases with w of the junction, so with the number of superconducting filaments. We have also explored the dependence on λ L by studying junctions where the oxygen microstructure has been altered in both barrier and electrodes by two different ways: irradiation with helium at 80 keV and annealings in oxygen atmosphere. |
| Databáze: | OpenAIRE |
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