Variation of the Pinning Force with Microstructure and with the Ginzburg-Landau Parameter in Type II Superconductors

摘要

The variation of the pinning force with microstructure and with the Ginzburg-Landau parameter is studied for 53 vanadium and vanadium alloy specimens. Vanadium-carbide precipitates are used as pinning centers. The Ginzburg-Landau parameter is varied by alloying the vanadium with small quantities of gallium or niobium. Alloy compositions of V-0.20a/o Ga, V-1.05a/o Ga, V-2.96a/0 Ga, and V-4.01a/o Nb are used.