Superconductivity in the ternary boride Cr₂Re₃B with the β-Mn-type structure

We report the superconducting properties of a new intermetallic superconductor, Cr₂Re₃B. Cr₂Re₃B has a cubic structure called the β-Mn-type structure with the space group P4₁32 (No. 213), and shows a superconducting transition at around T_c = 4.8 K. The magnetization curve shows a typical type-II superconducting behavior. The estimated superconducting parameters of lower and upper critical fields, coherence length ε(0), penetration depth γ (0), and Ginzburg-Landau (GL) parameter κ(0), determined using GL relations, are about H_c1(0) = 52 Oe, H_c2(0) = 100 kOe, γ(0) = 356 nm, ε (0) = 5.7 nm, and κ (0) = 62.5, respectively. The specific heat data indicates that the superconductivity in Cr ₂Re₃B can be described in the BCS theory. Finally, we discuss the superconducting state of Cr₂Re₃B using the determined parameters.