$A$-site-ordered perovskites ($A{A^{\prime }}_3{B}_4{\mathrm{O}}_{12}$) provide a structurally robust platform for exploring correlated-electron behavior, offering unusual opportunities to disentangle the roles of orbital degrees of freedom, bonding interactions, and local structural distortions. In this work, we synthesize a new $A$-site-ordered perovskite $\mathrm{PbC}{\mathrm{u}}_3{\mathrm{V}}_4{\mathrm{O}}_{12}$ under high-pressure and high-temperature conditions and perform comprehensive structural and physical characterizations. $\mathrm{PbC}{\mathrm{u}}_3{\mathrm{V}}_4{\mathrm{O}}_{12}$ crystallizes in the cubic $\mathit{Im}$-3 structure, yet its structural parameters deviate markedly from the established ionic-radius trend in the $A{\mathrm{Cu}}_3{\mathrm{V}}_4{\mathrm{O}}_{12}$ ($A=\mathrm{Mn}$, Cu, Ca) series. This deviation reveals local structural modifications driven by the ${\mathrm{Pb}}^{2+}$ lone-pair electrons. The compound exhibits metallic behavior down to at least 8 K and shows a moderately enhanced Sommerfeld coefficient, with density-functional calculations confirming the associated mass enhancement. Comparison of the experimental and theoretical magnetic susceptibilities further indicates an additional contribution from the Stoner mechanism. These results identify $\mathrm{PbC}{\mathrm{u}}_3{\mathrm{V}}_4{\mathrm{O}}_{12}$ as a rare example of a $3d$-electron metallic vanadate with moderate electronic correlations, demonstrating how $A$-site chemistry and lone-pair-induced local distortions can be used to engineer correlated electronic states in perovskite-related materials.

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• Heavy-fermion systems
• Perovskites
• Strongly correlated systems
• Transition metal oxides
• Pressure techniques