Transport and magnetisation measurements of Tl-1223 tapes-the nature of current paths and the role of grain boundaries at high magnetic fields

The key factors that make the thallium-based 1223 phase conductors attractive candidates for high field applications are a high transition temperature (/spl sim/ 115 K), and an irreversibility line comparable to YBa/sub 2/Cu/sub 3/O/sub 7/. However, a third important factor is the grain boundary beh...

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Bibliographic Details
Published in:IEEE transactions on applied superconductivity 1997-06, Vol.7 (2), p.1965-1968
Main Authors: Everett, J., Johnston, M.D., Perkins, G.K., Volkozub, A.V., Caplin, A.D., Moore, J.C., Fox, S., Hyland, D., Grovenor, C.R.M.
Format: Article
Language:English
Subjects:
Applied sciences
Bismuth compounds
Conducting materials
Conductors
Current measurement
Electric connection. Cables. Wiring
Electrical engineering. Electrical power engineering
Exact sciences and technology
Grain boundaries
Magnetic field measurement
Magnetic flux
Magnetization
Materials
Superconducting magnets
Temperature
Various equipment and components
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Summary:The key factors that make the thallium-based 1223 phase conductors attractive candidates for high field applications are a high transition temperature (/spl sim/ 115 K), and an irreversibility line comparable to YBa/sub 2/Cu/sub 3/O/sub 7/. However, a third important factor is the grain boundary behaviour. We have made detailed transport current-voltage (I-V) and magnetic studies of a Ag-0.1%Hf sheathed Tl-1223 tape. For low fields (B100 mT) there is a plateau region in its J/sub c/(B) characteristics. Possible scenarios for inter-granular transport current conduction and dissipation in this region are discussed.
ISSN:1051-8223
1558-2515
DOI:10.1109/77.620972