Abstract
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 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 below TN = 19 K. Surprisingly, there is strong evidence for dominant ferromagnetic fluctuations above TN, as reflected by positive Curie–Weiss temperature and extremely large negative magnetoresistance (MR) between TN and Tfl ≈200 K. Furthermore, the angle dependence of the MRab indicates field-induced spin reorientation from the ab-plane to a direction ≈45° from the ab plane. Compared to EuCd2As2, the doubled TN and Tfl make EuZn2As2 a better platform for exploring nontrivial magnetic and electronic properties in both magnetic fluctuation (TN < T < Tfl) and ordered (T < TN) regimes.
| Original language | English |
|---|---|
| Article number | 2200012 |
| Journal | Advanced Quantum Technologies |
| Volume | 5 |
| Issue number | 6 |
| DOIs | |
| State | Published - Jun 2022 |
Funding
Work at University of South Carolina and Louisiana State University was supported by NSF through Grant DMR-1504226. M.M. and W.X. were supported by the U.S. Department of Energy (DOE), Office of Science, Basic Energy Sciences under award DE-SC0022156. E.F. and H.B.C. were supported by the U.S. DOE, Office of Science, Office of Basic Energy Sciences, Early Career Research Program Award KC0402020, under Contract No. DE-AC05-e00OR22725. This research used resources at the High Flux Isotope Reactor and the Spallation Neutron Source, the DOE Office of Science User Facility operated by ORNL. A portion of this work was performed at the National High Magnetic Field Laboratory (NHMFL), which was supported by National Science Foundation Cooperative Agreement No. DMR-1644779 and the Department of Energy (DOE). J.S. acknowledges support from the DOE BES program “Science at 100 T,” which permitted the design and construction of specialized equipment used in the high-field studies. Work at University of South Carolina and Louisiana State University was supported by NSF through Grant DMR‐1504226. M.M. and W.X. were supported by the U.S. Department of Energy (DOE), Office of Science, Basic Energy Sciences under award DE‐SC0022156. E.F. and H.B.C. were supported by the U.S. DOE, Office of Science, Office of Basic Energy Sciences, Early Career Research Program Award KC0402020, under Contract No. DE‐AC05‐e00OR22725. This research used resources at the High Flux Isotope Reactor and the Spallation Neutron Source, the DOE Office of Science User Facility operated by ORNL. A portion of this work was performed at the National High Magnetic Field Laboratory (NHMFL), which was supported by National Science Foundation Cooperative Agreement No. DMR‐1644779 and the Department of Energy (DOE). J.S. acknowledges support from the DOE BES program “Science at 100 T,” which permitted the design and construction of specialized equipment used in the high‐field studies.
| Funders | Funder number |
|---|---|
| Spallation Neutron Source | |
| National Science Foundation | DMR‐1644779, DMR‐1504226 |
| U.S. Department of Energy | |
| Office of Science | |
| Basic Energy Sciences | DE‐AC05‐e00OR22725, DE‐SC0022156, KC0402020 |
| Oak Ridge National Laboratory |
Keywords
- antiferromagnetic orders
- ferromagnetic fluctuations
- topological states
- type-IV magnetic space group