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arXiv · 1912.04507

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

Sabyasachi Paul·SK Ramjan·R Venkatesh·L S Sharath Chandra·M K Chattopadhyay
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Abstract

The V-Ti alloys are promising materials as alternate to the commercial Nb-based superconductors for high current-high magnetic field applications. However, the critical current density (J_c) of these alloys are somewhat low due to their low grain-boundary density. We show here that grain refinement of the V-Ti alloys and enhancement of the J_c can be achieved by the addition of Gd 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 increasing Gd content up to 1 at. % Gd, where they are more than 20 times higher than those of the parent V_0.60Ti_0.40 alloy. Introduction of Gd into the system also leads to ferromagnetic (FM) correlations, and the alloys containing more than 0.5 at. % Gd exhibit spontaneous magnetization. In spite of the FM correlations, the superconducting transition temperature increases slightly with Gd-addition.

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Sabyasachi Paul, SK Ramjan, R Venkatesh, L S Sharath Chandra, M K Chattopadhyay. 2019-12-10. Grain refinement and enhancement of critical current density in the V_0.60Ti_0.40 alloy superconductors with Gd addition. https://arxiv.org/abs/1912.04507

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