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Mechanism of Saturation and Nonsaturation of the Global Pinning Force in Superconducting Nb–Ti

The global pinning froce in Nb-49wt%Ti wires precipitated by heat treatment shows saturation at high fields. From the measurements of the Labusch parameter and the interaction distance in this regime, saturation is considered to be caused by a catastrophic instability of the pinned fluxoid lattice but not by the shearing deformation. The global pinning force increases largely by additional cold working of the wire. This enhancement is attained by stabilization of the defective fluxoid lattice by stronger pinning forces of the elongated precipitates.