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Pinning Mechanisms in YBCO Tapes
In this thesis work, a study on flux pinning mechanisms of commercial YBCO tapes is presented. This study has been performed via critical current characterization using transport (via direct I-V curves) and magnetization (via a Vibrating Sample Magnetometer) measurements. The latter one...
Autor principal: | |
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Formato: | info:eu-repo/semantics/article |
Lenguaje: | eng |
Publicado: |
Politecnico di Milano
2015
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Materias: | |
Acceso en línea: | http://cds.cern.ch/record/2104459 |
Sumario: | In this thesis work, a study on flux pinning mechanisms of commercial YBCO tapes is presented. This study has been performed via critical current characterization using transport (via direct I-V curves) and magnetization (via a Vibrating Sample Magnetometer) measurements. The latter ones turned out to be better concerning the comprehension of the pinning landscape of the provided samples, as a wider range of magnetic fields and temperatures is available for those measurements in the setup I used. The comparison of the experimental data with existing theoretical models allowed me to draw a picture of the pinning mechanisms underlying in each sample, and they turned out to be quite different one another.
Moreover, for high-performance research tapes, another interesting feature has been found: the counterplay between the self-field critical current and the in-field one. Very well engineered artificial pinning structures limit the self-field critical current density due to the high density of defects, while samples with high degree of cristallinity have their in-field performances limited due to the poor pinning properties. |
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