Millimeter-sized ${\mathrm{MnBi}}_2{\mathrm{Te}}_4$ single crystals are grown out of a Bi-Te flux and characterized using magnetic, transport, scanning tunneling microscopy, and spectroscopy measurements. The magnetic structure of ${\mathrm{MnBi}}_2{\mathrm{Te}}_4$ below $T_N$ is determined by powder and single-crystal neutron diffraction measurements. Below $T_N$ = 24 K, ${\mathrm{Mn}}^{2+}$ moments order ferromagnetically in the $ab$ plane but antiferromagnetically along the crystallographic $c$ axis. The ordered moment is 4.04(13)${\mu }_B$/Mn at 10 K and aligned along the crystallographic $c$ axis in an A-type antiferromagnetic order. Below $T_N$, the electrical resistivity drops upon cooling or when going across the metamagnetic transition in increasing magnetic fields. A critical scattering effect is observed in the vicinity of $T_N$ in the temperature dependence of thermal conductivity, indicating strong spin-lattice coupling in this compound. However, no anomaly is observed in the temperature dependence of thermopower around $T_N$. Fine tuning of the magnetism and/or electronic band structure is needed for the proposed topological properties of this compound. The growth protocol reported in this work might be applied to grow high-quality crystals where the electronic band structure and magnetism can be finely tuned by chemical substitutions.

A new disordered chlorospinel superionic conductor, Li₂Sc_2/3Cl₄, enables high-voltage all solid state batteries up to 4.6 V vs. Li⁺/Li.