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Superconductivity at 4.4 K in Ba2Bi3

We report on the superconductivity in Ba2Bi3, which contains planar anionic Bi ribbon nets with four- and three-bonded Bi separated by cationic Ba layers. A nearly single-phase sample is synthesized by reacting Ba and Bi powders at 800 °C under a pressure of 1 GPa. The temperature-dependent resistivity ρ(T) shows metallic behavior with a residual resistivity ratio of 27.3 and indicates a sharp superconducting transition at 4.4 K. The magnetic susceptibility has a large diamagnetic transition at a similar temperature. From the analysis of ρ(T), the Debye temperature ΘD and electron−phonon coupling constant λ e − p are derived as 75.9 K and 1.0, respectively, indicating that Ba2Bi3 is a superconductor in the strong-coupling regime. Ba2Bi3 is a type-II superconductor with an estimated upper critical field Hc2(0) of about 1.23 T. For increasing pressures up to 1.5 GPa, Tc linearly decreases with a slope of −0.56 K GPa−1.