Unusual Magneto-transport Properties Observed in EuZn₂As₂ under High Magnetic Field

For magnetic materials that belong to the type-IV magnetic space group, the nontrivial symmetry is expected to produce topological phases. Layered EuT₂Pn₂ (T = Zn, Cd; Pn = As, Sb) may hold such promises. While Eu forms an A-type antiferromagnetic (AFM) ordering in all of these compounds, the transition temperature for EuZn₂As₂ is the highest with T_N = 19 K. Our magneto-transport measurements show extremely large response of the electrical resistivity to both internal and external magnetic field. We will present the temperature and magnetic field dependence of the resistivity anisotropy under various field and current configurations. By applying pulse field up to 60 T, the non-monotonic field dependence of the resistivity reflects three spin configurations corresponding to the A-type AFM (low field), ferromagnetic (intermediate field), and canted AFM states. Implications of our results will be discussed.