engleski

Effect of fission tracks on flux pinning and the resistive transition in neutron irradiated uranium-doped Ag/Bi2223 tapes

The extended defects produced by the fission of neutron-irradiated U-235 inclusions in Ag/Bi2223 superconducting tapes act as very effective pinning centres. Substantial improvements in the magnetic field dependence of the critical current densities, J(c), and in the irreversibility line of treated tapes have previously been observed. The magnetoresistance of Ag/Bi2223 tapes treated with the doping and irradiation technique has been measured, and activation energies calculated from the Arrhenius plots. The findings corroborate the previous J(c), results, confirming the strong pinning action of the extended columnar defects, particularly in fields aligned along the c-axis of the tapes.

Ag/Bi2223 superconductor; flux pinning; uranium doping

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