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We report the synthesis and characterization of phase pure Ta3Sb, a materialpredicted to be topological with eightfold degenerate fermionic states [Science353, aaf5037 (2016)] and to exhibit a large spin Hall effect [Sci. Adv. 5,eaav8575 (2019]. We observe superconductivity in Ta3Sb with Tc~ 0.67 K in bothelectrical resistivity \r{ho}(T) and specific heat C(T) measurements. Fielddependent measurements yield the superconducting phase diagram with an uppercritical field of Hc2(0) ~ 0.95 T, corresponding to a superconducting coherencelength of {\xi} ~18.6 nm. The gap ratio deduced from specific heat anomaly,2{\Delta}0/kBTc is 3.46, a value close to the Bardeen-Cooper-Schrieffer (BCS)value of 3.53. From a detailed analysis of both the transport and thermodynamicdata within the Ginsburg-Landau (GL) framework, a GL parameter of \k{appa} ~90is obtained identifying Ta3Sb as an extreme type-II superconductor. Theobservation of superconductivity in an eightfold degenerate fermionic compoundwith topological surface states and predicted large spin Hall conductancepositions Ta3Sb as an appealing platform to further explore exotic quantumstates in multifold degenerate systems.

Superconducting properties of the spin Hall candidate Ta3Sb with eightfold degeneracy