, an axion insulator candidate*

EuIn₂As₂ is a Zintl compound recently reported as a possible first example of axion insulator with antiferromagnetic (AF) long-range order and characteristic colossal negative magnetoresistance. It thus represents a unique platform to investigate the physics of axion insulators and, in particular, to focus on the interplay between the AF order and the topologically protected features of the electronic band structure. Here, we present results from single-crystal magnetic diffraction experiments. Surprisingly, our results reveal the successive stabilization of two different sets of magnetic Bragg reflections indexed with the propagation vectors k₁=(0,0,0.31) and k₂=(0,0,0) below T_N1=17 and T_N2=15 K, respectively, despite the chemical unit cell containing only a single Eu site. The two magnetic structures are believed to coexist at T≤T_N2, and were individually determined from refinement analyses. We will describe both magnetic structures and discuss the influence of our results upon the current understanding of the material’s topological features.