Superconductivity of the new medium-entropy alloy V4Ti2W with a body-centered cubic structure

Medium- and high-entropy alloy (MEA and HEA) superconductors have attracted considerable interest since their discovery. This paper reports the superconducting properties of ternary tungsten-containing MEA V 4 Ti 2 W for the first time. V 4 Ti 2 W is a type II superconductor with a body-centered cubic (BCC) structure. This structure belongs to the space group Im 3 ̅ $\bar{3}$ m (No. 229) with the cell parameters a = b = c = 3.10673(14) Å. Experimental results of resistivity, magnetization, and heat capacity indicate that the superconducting transition temperature of the MEA V 4 Ti 2 W is roughly 5.0 K. The critical magnetic fields at the upper and lower ends are 9.93(2) T and 40.7(3) mT, respectively. Interestingly, few BCC MEA superconductors with VEC greater than 4.8 have been found. The addition of tungsten leads to a VEC of 4.83 e/a for V 4 Ti 2 W, which is rarely higher than the 4.8 value. Adding tungsten element expands the variety of MEA alloys, which may improve the microstructure and mechanical properties of materials and even superconducting properties. This material could potentially offer a new platform for the investigation of innovative MEA and HEA superconductors.