Fig. 1. Magnetic and transport properties of bulk AFM MnBi₄Te₇.

a The view of the crystal structure of MnBi₄Te₇ from the [110] directions. Red arrow: Mn spins in the A-type AFM state. Blue block: edge-sharing BiTe₆ octahedra; Pink block: edge-sharing MnTe₆ octahedra, which are connected to the blue block via edge-sharing. J_⊥ is the interlayer exchange coupling. b The (00l) X-ray diffraction peaks of the cleaved ab plane of MnBi₄Te₇. Inset: A piece of MnBi₄Te₇ against 1-mm scale. c The temperature dependent field-cooled susceptibility and inverse susceptibility taken at H = 0.1 T for H || ab and H || c. Average χ is calculated by ${\chi }^{\mathrm{ave}}=\left(2{\chi }^{\mathrm{ab}}+{\chi }^{\mathrm{c}}\right)∕3$. d and e: Full magnetic hysteresis loop of isothermal magnetization taken at various temperatures for: d H || c and e H || ab. f The temperature dependent ρ_xx (I || ab) and ρ_zz (I || c). g Transverse magnetoresistance with I || ab and H || c at various temperatures.