Abstract
The flux pinning property in superconducting Bi-2223 tape wires under the magnetic field parallel to the c-axis is theoretically analyzed by using the flux creep model. The irreversibility field is estimated from the critical current density observed at sufficiently low temperatures and the obtained result is compared with experiments. The normalized pinning force density at various temperatures is found to meet on a single curve, when it is plotted versus the magnetic field normalized by the irreversibility field. Such a scaling behavior is compared with experiments. From agreements between the theory and experiments on the irreversibility field and the scaling law, it is concluded that the flux creep model describes well the pinning phenomena in superconducting Bi-2223 tape wires. The irreversibility line is theoretically estimated for a superconductor with artificially introduced pinning centers which will be fabricated in the future. It is found that the irreversibility field reaches 9 T at 77.3 K.
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