Abstract
We report here the superconducting properties of W 5 SiB 2 . W 5 SiB 2 has a T 2 phase structure with the space group I 4/ m c m . Magnetic susceptibility, electrical resistivity, and specific heat data show that W 5 SiB 2 is a superconductor with a transition temperature ( T c ) of 5.8 K. The magnetization versus magnetic field ( M – H ) curve shows the typical type-II superconducting behavior. The estimated lower critical field H c1 (0) and upper critical field H c2 (0) are about 120 and 5200 Oe, respectively. The penetration depth λ and coherence length ξ are calculated to be approximately 210 and 25 nm, respectively, using Ginzburg–Landau (GL) equations. The estimated Sommerfeld coefficient γ N is 12.8 mJ/(mol K 2 ). The normalized specific heat jump Δ C /γ N T c is estimated to be about 1.49, which is near the value predicted by the BCS theory in the weak-coupling limit, i.e., Δ C /γ N T c = 1.43. This finding indicates that superconductivity in W 5 SiB 2 exists within the week-coupling regime.
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