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We report both experimental and theoretical investigations of the physicalproperties of Ba$_\mathrm{2}$Mn$_\mathrm{2}$Sb$_\mathrm{2}$O single crystals.This material exhibits a hexagonal structure with lattice constants: a =4.7029(15) \AA{} and c = 19.9401(27) \AA{}, as obtained from powder X-raydiffraction measurements, and in agreement with structural optimization throughdensity functional theory (DFT) calculations. The magnetic susceptibility andspecific heat show anomalies at T$_\mathrm{N}$ = 60 K, consistent withantiferromagnetic ordering. However, the magnitude of T$_\mathrm{N}$ issignificantly smaller than the Curie-Weiss temperature($\mid$$\mathrm{\Theta_{CW}}$$\mid$ $\approx$ 560 K), suggesting a magneticsystem of reduced dimensionality. The temperature dependence of both thein-plane and out-of-plane resistivity changes from an activated at $T$ $>$T$_\mathrm{x}$ $\sim$ 200 K to a logarithmic at $T$ $<$ T$_\mathrm{x}$.Correspondingly, the magnetic susceptibility displays a bump at T$_\mathrm{x}$.DFT calculations at the DFT + U level support the experimental observation ofan antiferromagnetic ground state.

Physical Properties of $Ba_2 Mn_2 Sb_2 O$ Single Crystals