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Under the application of tensile stress to a multilamentary Bi2Sr2Ca2Cu3O10+x (Bi2223) composite tape sample composed of a series of sections, the relation of superconducting properties (voltage– current curve, critical current and n-value) of sections to those of the sample were studied experimentally and analytically. The voltage–current curve of the most extensively cracked section whose critical current was the lowest among the sections, was the nearest in position to the voltage–current curve of the sample and played a dominant role in determination of the critical current of the sample. On the other hand, the n-value of the sample was signi cantly affected not only by the voltage–current curve of the most extensively cracked section but also on the position in relation to the voltage– current curves between the most extensively cracked section and the other sections. The denser the voltage–current curve of the other sections in the neighborhood of the voltage–current curve of the most extensively cracked section, the higher the n-value of sample became. In analysis of the experimental results, an equivalent crack current shunting model, in which multiple cracks existing inside were replaced by an equivalent crack, was employed. With this model, the measured critical current and n-value of both sections and sample, and the correlation between n-value and critical current both for sections and sample, were described satisfactorily. [doi:10.2320/matertrans.MBW201502]

materials transactions

Relation of Critical Current and &lt;i&gt;n&lt;/i&gt;-Value of Local Sections to Those of Sample in a Multi-Filamentary Bi2223 Superconducting Composite Tape with Applied Stress-Induced Cracks