Stability of supercurrents in a BiSrCaCuO (Bi-2212) high- Tcsuperconductor with artificially created defects |
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| Affiliation: | 1. Department of Geo- and Environmental Sciences, Crystallography Section, Ludwig Maximilian University Munich, Theresienstr. 41, 80333 Munich, Germany;2. Heinz Maier-Leibnitz Zentrum (MLZ), Technische Universität München, 85748 Garching, Germany;3. Institute for Inorganic Chemistry, University of Leipzig, Johannisallee 29, D-04103 Leipzig, Germany;4. Institute for Mineralogy, Crystallography and Materials Science, Leipzig University, Scharnhorststr. 20, D-04275 Leipzig, Germany |
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| Abstract: | Recent results in a systematic study of the stability of supercurrents in Bi-2212 tapes with randomly oriented, highly splayed columnar defects are presented as a function of defect density. The defects were artificially created by fission fragments of bismuth nuclei, fissioned by irradiation with energetic protons (∼0.8 GeV). Significant enhancements in the persistent current density Jpare observed at all temperatures and fields. Also, a marked shift of the irreversibility line towards higher fields and temperatures improves considerably the capacity of the material for practical applications. Moreover, a significant decrease in the logarithmic decay rate S = dln (Jp) /dln(t) indicates a strong stabilization of the persistent currents. All features point to high effectiveness of this artificial pinning mechanism. However, the optimal proton fluence needs yet to be established. |
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