Bulk superconductivity is reported in BaNb2S5 at the transition temperature Tc = 0.85(1) K. The electrical resistivity ? versus T is metallic with ?(2 K) = 42.4 ?? cm. The magnetic susceptibility is paramagnetic, with temperature-independent contributions due to diamagnetism, Pauli paramagnetism, and Van Vleck paramagnetism; a Curie-Weiss contribution appears to be impurity related. Hall effect measurements show that the majority charge carriers are electrons with charge-carrier concentration n(3 K) = 2.40(2)?×?1021 cm. Specific heat measurements reveal an electronic specific heat coefficient ? = 11.2(1) mJ/mol K2, a Debye temperature ?D = 126.4(8) K, and an energy gap associated with the superconducting state of Eg = 0.184(4) meV. Measurements of ?(T) in magnetic field provide the upper critical magnetic field of about 3055(74) Oe as T??? 0 K, which was used to estimate the coherence length ? = 6.21(15) nm. The results allow classification of BaNb2S5 as a Type II, BCS superconductor in the dirty limit.
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