The resistivity vs. temperature characteristics were measured under the magnetic field for a weakly pinned Nb-Ti specimen to discuss the behavior of fluxoids. A sharp variation in the resistivity was observed. The experimental results on the resistive transition, the critical current density and the irreversibility line are compared with the theoretical analysis based on the flux creep and flow. Agreement is satisfactory and the observed sharp variation in the resistivity is explained to come from a sharp variation in the critical current density near the irreversibility line.
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