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The crystal structure and physical properties of the layered material EuMnBi2have been characterized by measurements on single crystals. EuMnBi2 isisostructural with the Dirac material SrMnBi2 based on single crystal x-raydiffraction, crystallizing in the I4/mmm space group (No. 139). Magneticsusceptibility measurements suggest antiferromagnetic (AFM) ordering of momentson divalent Eu ions near T_N=22K. For low fields, the ordered Eu moments arealigned along the c-axis, and a spin-flop is observed near 5.4T at 5K. Themoment is not saturated in an applied field of 13T at 5K, which is uncommon forcompounds containing Eu^{2+}. The magnetic behavior suggests an anisotropyenhancement via interaction between Eu and the Mn moments that appear to beorder antiferromagnetically below approximately 310K. A large increase in themagnetoresistance is observed across the spin-flop, with absolutemagnetoresistance reaching approximately 650% at 5K and 12T. Hall effectmeasurements reveal a decrease in the carrier density below T_N, which impliesa manipulation of the Fermi surface by magnetism on the sites surrounding theBi square nets that lead to Dirac cones in this family of materials.

Effect of Eu magnetism on the electronic properties of the candidate Dirac material EuMnBi2