Superconducting Properties of BaBi${}_3$

We report the superconducting properties of single crystals of the intermetallic perovskite-related compound BaBi${}_3$. The superconducting transition temperature ($T_c=5.82$~K) was obtained from heat capacity measurements. Using the measured values for the critical fields $H_{c1}, H_{c2}$,andthespecificheat$C$, we estimate the thermodynamic critical field $H_c$(0), coherence length $\xi$(0), Debye temperature ${\mathrm{\Theta }}_D$ and coupling constant ${\lambda }_{ep}$. $\mathrm{\Delta }C\mathrm{/}\gamma T_c$ and $\lambda {ep}$suggestthatBaBi${3}$isamoderatelycoupledsuperconductorand$\gamma $ suggests an enhanced density of states at the Fermi level. Electronic band structure calculations show a complex Fermi surface and a moderately high DOS at the Fermi level. Further analysis of the electronic specific heat shows that the superconducting properties are dominated by s-wave gap.