Fig. 1: Crystal structure and superconducting (SC) transition temperature of Ta–Nb–Hf–Zr–Ti HEA SC thin films.
From: High critical current density and high-tolerance superconductivity in high-entropy alloy thin films
a Schematic of the bcc lattice with randomly distributed atoms of the Ta1/6Nb2/6Hf1/6Zr1/6Ti1/6 HEA superconductor. b XRD results for Ta–Nb–Hf–Zr–Ti HEA SC thin films deposited on a c-cut Al2O3 substrate at Ts = 270, 370, 470, 520, 570, and 620 °C, indicating a (110) preferred orientation. The inset shows a cross-sectional SEM image for the film fabricated at Ts = 520 °C. c The lattice parameter (a0) of HEA SC thin films with respect to substrate temperature Ts. d, e Temperature dependence of the electrical resistivity (ρ) and magnetization (M) for the Ta–Nb–Hf–Zr–Ti HEA SC thin films, respectively. Here, ρ(T) and M(T) were normalized to the ρ at the Tc onset (ρn) and the absolute zero-field-cooled (ZFC) M value at 1.8 K, respectively, for comparison. The field-cooled (FC) and ZFC M(T) were measured at 5 Oe (applied perpendicularly to the film plane).
