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We describe three previously unreported superconductors, BaPb3,Ba0.89Sr0.11Pb3 and Ba0.5Sr0.5Pb3. These three materials, together with SrPb3,form a distinctive isoelectronic family of intermetallic superconductors basedon the stacking of Pb planes, with crystal structures that display a hexagonalto cubic perovskite-like progression, as rarely seen in metals. Thesuperconducting transition temperatures (Tc) are similar for all - 2.2 K forBaPb3, 2.7 K for Ba0.89Sr0.11Pb3 and 2.6 K for Ba0.5Sr0.5Pb3, and thepreviously reported Tc of SrPb3, ~ 2 K, is confirmed. The materials aremoderate coupling superconductors, and calculations show that the electronicdensities of states at the Fermi energy are primarily contributed by Pb. Theobservations suggest that the Pb-stacking variation has only a minor effect onthe superconductivity.

A Family of Pb-based Superconductors with Variable Cubic to Hexagonal Packing