Abstract
AbstractEu‐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 properties of EuZn2As2 through measurements of the electrical resistivity, Hall effect, magnetization, and neutron diffraction. Their data show that EuZn2As2 orders antiferromagnetically with an A‐type spin configuration belowTN = 19 K. Surprisingly, there is strong evidence for dominant ferromagnetic fluctuations aboveTN, as reflected by positive Curie–Weiss temperature and extremely large negative magnetoresistance (MR) betweenTNandTfl≈200 K. Furthermore, the angle dependence of the MRabindicates field‐induced spin reorientation from theab‐plane to a direction ≈45° from theabplane. Compared to EuCd2As2, the doubledTNandTflmake EuZn2As2 a better platform for exploring nontrivial magnetic and electronic properties in both magnetic fluctuation (TN < T < Tfl) and ordered (T < TN) regimes.
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