Ternary superconductor `NbTiTa´ for high field superfluid magnets

The possibility of obtaining a higher Hc₂ upper critical field in the NbTi system, which is normally limited by a spin-orbit coupling term, is discussed. The introduction of scattering reduces this coupling, The spin-orbit scattering rate is proportional to Z⁴ and therefore leads logically to the introduction of a high-atomic-number element which is more or less similar with respect to all element which is more or less similar with respect to all of the other properties, i.e. T_c. Previous studies have shown tantalum to be an excellent choice. In the present work, an attempt to obtain a high-current-density, high-field ternary magnet conductor (J_c (10T, 2 K, ρ_eff=10^-12 Ω-cm))>2000 A/mm² is reported. This goal was met, but the conductor was clearly not optimized