4.5 Article

Giant magnetoresistance and topological Hall effect in the EuGa4 antiferromagnet

期刊

出版社

IOP Publishing Ltd
DOI: 10.1088/1361-648X/ac3102

关键词

magnetoresistance; topological Hall effect; topological spin textures

资金

  1. Natural Science Foundation of Shanghai [21ZR1420500, 21JC1402300]
  2. Schweizerische Nationalfonds zur Forderung der Wissenschaftlichen Forschung (SNF) [200021_188706, 206021_139082]
  3. Shanghai Pujiang Program [21PJ1403100]
  4. National Natural Science Foundation of China (NSFC) [12174103, 11874150]
  5. Sino-Swiss Science and Technology Cooperation [IZLCZ2-170075]

向作者/读者索取更多资源

We report on a systematic study of the temperature and magnetic field dependence of the binary compound EuGa4. We observe a giant nonsaturating magnetoresistance at low temperatures and a series of metamagnetic transitions in an applied magnetic field. Additionally, we observe a hump-like anomaly in the Hall resistivity below the critical temperature.
We report on systematic temperature- and magnetic field-dependent studies of the EuGa4 binary compound, which crystallizes in a centrosymmetric tetragonal BaAl4-type structure with space group I4/mmm. The electronic properties of EuGa4 single crystals, with an antiferromagnetic (AFM) transition at T-N similar to 16.4 K, were characterized via electrical resistivity and magnetization measurements. A giant nonsaturating magnetoresistance was observed at low temperatures, reaching similar to 7x10(4) % at 2 K in a magnetic field of 9 T. In the AFM state, EuGa4 undergoes a series of metamagnetic transitions in an applied magnetic field, clearly manifested in its field-dependent electrical resistivity. Below T-N, in the similar to 4-7 T field range, we observe also a clear hump-like anomaly in the Hall resistivity which is part of the anomalous Hall resistivity. We attribute such a hump-like feature to the topological Hall effect, usually occurring in noncentrosymmetric materials known to host topological spin textures (as e.g., magnetic skyrmions). Therefore, the family of materials with a tetragonal BaAl4-type structure, to which EuGa4 and EuAl4 belong, seems to comprise suitable candidates on which one can study the interplay among correlated-electron phenomena (such as charge-density wave or exotic magnetism) with topological spin textures and topologically nontrivial bands.

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