a b s t r a c tIn the Mo-Si binary system, Mo 5 Si 3 crystallizes in the W 5 Si 3 (T 1 phase) structure type. However, when boron replaces silicon in this compound, a structural transition occurs from the W 5 Si 3 prototype structure to the Cr 5 B 3 prototype structure (T 2 phase) at the composition Mo 5 SiB 2 . Mo 5 SiB 2 has received much attention in the literature as a candidate for structural application in high-temperature turbines, but its electronic and magnetic behavior has not been explored. In this work, we show that Mo 5 SiB 2 is a bulk superconducting material with critical temperature close to 5.8 K. The specific-heat, resistivity and magnetization measurements reveal that this material is a conventional type II BCS superconductor.
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