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We investigated the impact of annealing on the structural characteristics andsuperconducting critical temperature ($T_\mathrm{c}$) of the eutectichigh-entropy alloy (HEA) superconductor NbScTiZr. The HEA manifests an eutecticmicrostructure composed of body-centered cubic (bcc) and hexagonal close-packedphases. Both the lattice parameters of the bcc phase and grain size of theeutectic structure exhibited pronounced sensitivity to variations in annealingtemperature. The observed dependence of the lattice parameter on annealingtemperature supports the possibility that lattice strain occurs at lowerannealing temperatures. The as-cast sample demonstrated superconductivity at$T_\mathrm{c}$ of 7.9 K, which increased to 9 K after annealing at 800$^{\circ}$C. However, when subjected to annealing at 1000 $^{\circ}$C,$T_\mathrm{c}$ diminishes to 8.7 K. The annealing-temperature dependence of$T_\mathrm{c}$ cannot be comprehensively elucidated based solely on theelectronic density of states at the Fermi level. It is plausible that thelattice strain may influence the annealing temperature dependence of$T_\mathrm{c}$. Our results for the critical current density $J_{c}$ revealthat the self-field $J_{c}$ of the as-cast NbScTiZr at 2 K exceeds 10$^{6}$A/cm$^{2}$.

Effect of annealing in eutectic high-entropy alloy superconductor NbScTiZr