Magnetic Anisotropy and Superconducting Properties of NbScTiZr Eutectic High-Entropy Alloy

The eutectic high-entropy alloy NbScTiZr exhibits tunable superconducting properties influenced by crystallographic anisotropy and lattice strain. We model the anisotropic energy (E*) to explain its critical temperature (T_c), upper critical field (H_c2), and flux pinning. E* calculations for [100], [110], and [111] directions reveal maximal anisotropy along [111] (E* = 1.5122), correlating with enhanced flux pinning in 400°C-annealed samples. Specific heat measurements indicate strong-coupled superconductivity (2Δ(0)/k_BT_c = 4.43-4.85) in samples annealed above 600°C. These results demonstrate how strain engineering can optimize superconducting performance in eutectic HEAs