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The V-Ti alloys are promising materials as alternate to the commercialNb-based superconductors for high current-high magnetic field applications.However, the critical current density (J_c) of these alloys are somewhat lowdue to their low grain-boundary density. We show here that grain refinement ofthe V-Ti alloys and enhancement of the J_c can be achieved by the addition ofGd into the system, which precipitates as clusters along the grain boundaries.Both the J_c and the pinning force density (F_P) increase with the increasingGd content up to 1 at. % Gd, where they are more than 20 times higher thanthose of the parent V_0.60Ti_0.40 alloy. Introduction of Gd into the systemalso leads to ferromagnetic (FM) correlations, and the alloys containing morethan 0.5 at. % Gd exhibit spontaneous magnetization. In spite of the FMcorrelations, the superconducting transition temperature increases slightlywith Gd-addition.

Grain refinement and enhancement of critical current density in the V_0.60Ti_0.40 alloy superconductors with Gd addition