We report a comprehensive study of electronic-correlation effects in manganese-based antiferromagnetic pnictides ${\mathrm{BaMn}}_2{\mathrm{Pn}}_2$ ($\mathrm{Pn}=\mathrm{P}$, As, Sb, Bi). Our density functional theory plus slave-spin mean-field simulations indicate that all the compounds lie on the strong-coupling side of an itinerant-to-localized moment crossover, corresponding to the critical interaction strength for the Mott transition in the high-temperature paramagnetic phase. We also show that the experimental Néel temperature of each compound scales with the distance from this crossover.

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• Antiferromagnetism
• Magnetic order
• Antiferromagnets
• Pnictides
• Superconductors
• First-principles calculations
• Many-body techniques