Abstract
The c-axis oriented Bi-Pb-Sr-Ca-Cu-O samples have been prepared by sintering and several times of pressing and re-sintering procedure. The repeat of pressing and sintering improved the critical current density as a function of the field (B), Jc(B). It is found that Jc(B) is given by Jc(0)(B/B*)-a at low magnetic fields (a few mT < B < several 10mT) and by J0exp(-B/B0) at high fields (0.05T < B <several T) at 77K. By the pressing and sintering procedure, the fitting parameters of B*, B0 and J0 are increased and the power index of a is decreased. The field direction dependence of those parameters is also shown. The V-I characteristics up to a current density much higher than 102 × Jc have been measured by using a pulsed current. It is found that the intra-grain Jc is at least higher than 2.3 × 10 A/cm2 at 77K and zero external field and the resistance in the weak link regions is decreased as decreasing the temperature. The latter fact is consistent with our proposal that the weak link regions are not any insulators but a superconductor.
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© 1990 Plenum Press, New York
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Wakata, M. et al. (1990). Superconducting Properties of Bi-Pb-Sr-Ca-Cu-O System. In: Reed, R.P., Fickett, F.R. (eds) Advances in Cryogenic Engineering Materials . An International Cryogenic Materials Conference Publication, vol 36. Springer, Boston, MA. https://doi.org/10.1007/978-1-4613-9880-6_78
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DOI: https://doi.org/10.1007/978-1-4613-9880-6_78
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