Temperature and magnetic field dependence of the critical current of BiSrCaCuO tape conductors

Laan van der, D.C. and Eck van, H.J.N. and Haken ten, B. and Schwartz, J. and Kate ten, H.H.J. (2001) Temperature and magnetic field dependence of the critical current of BiSrCaCuO tape conductors. IEEE Transactions on Applied Superconductivity, 11 (1). pp. 3345-3348. ISSN 1051-8223

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Abstract:	In order to improve the understanding of the dominant mechanisms that limit the critical current in high temperature superconductors, the dependence of the critical current on magnetic field and temperature of a Bi2Sr2Ca2Cu3Ox tape has been investigated in detail. The critical current is measured in magnetic fields up to 8 T, at temperatures ranging from 4.2 K to 70 K. The results are compared with existing models that describe the current path as two parallel systems, one depending on weak links and the other on flux pinning. The critical current at low magnetic fields is reduced drastically by the self-field of the superconductor. At intermediate magnetic fields, the field dependence of the critical current is mainly dominated by weak links, while at higher fields it is dominated by the strong-links current path, and depends on flux pinning. To clarify the models used to describe the measurements, the temperature dependence of the parameters used in the models is studied. The temperature dependence of the parameters used to describe the weak-links current path points out that the weak links are formed by remnant Bi2Sr2Ca1Cu2Ox phase at the grain boundaries
Item Type:	Article
Copyright:	©2001 IEEE
Faculty:	Science and Technology (TNW)
Research Group:	Low Temperatures - Biomagnetism (LT) Energy, Materials and Systems (EMS)
Link to this item:	http://purl.utwente.nl/publications/36170
Official URL:	http://dx.doi.org/10.1109/77.919779
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