Superconductivity in transition metal-silicide W5Si3

We report here the superconducting properties of the tungsten silicide W 5 Si 3 . Electrical resistivity and magnetic susceptibility measurements as functions of temperature and magnetic field show a bulk superconductivity with T c = 2.7 K. The magnetization versus magnetic field ( M — H ) curve shows a typical type-II superconducting behavior. Furthermore, we present the H — T phase diagram and estimate the upper critical field H C2 (0) to be about 5200 Oe. We also discuss the superconducting properties in a Ginzburg-Landau framework and estimate the lower critical magnetic field H C1 (T) , penetration depth λ and coherence length ξ to be about 33 Oe, 450 nm, and 25 nm, respectively.