Physical Properties of $Ba_2 Mn_2 Sb_2 O$ Single Crystals

J. Li; C. E. Ekuma; I. Vekhter; M. Jarrell; J. Moreno; S. Stadler; A. B. Karki; R. Jin

doi:10.1103/PhysRevB.86.195142

paper

Physical Properties of $B a_{2} M n_{2} S b_{2} O$ Single Crystals

arXiv:1212.0014 · doi:10.1103/PhysRevB.86.195142

Abstract

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

6 Pages, 5 Figures, and 1 Table

Physical Properties of Ba2​Mn2​Sb2​O Single Crystals

Abstract

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Physical Properties of $B a_{2} M n_{2} S b_{2} O$ Single Crystals