Unusual Electrical and Magnetic Properties in Layered EuZn ₂ As ₂

Eu-based compounds often exhibit unusual magnetism, which is critical for nontrivial topological properties seen in materials such as EuCd2As2. The authors investigate the structure and physical of EuZn2As2 through measurements electrical resistivity, Hall effect, magnetization, neutron diffraction. Their data show that orders antiferromagnetically with an A-type spin configuration below TN = 19 K. Surprisingly, there strong evidence dominant ferromagnetic fluctuations above TN, reflected by positive Curie–Weiss temperature extremely large negative magnetoresistance (MR) between Tfl ≈200 Furthermore, angle dependence MRab indicates field-induced reorientation from ab-plane to a direction ≈45° ab plane. Compared EuCd2As2, doubled make better platform exploring magnetic electronic both fluctuation (TN < T Tfl) ordered (T TN) regimes.