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Large Anomalous and Topological Hall Effect and Nernst Effect in a Dirac Kagome Magnet Fe3 Ge

Journal Article · · Advanced Functional Materials
 [1];  [2];  [3];  [3];  [2];  [2];  [4];  [5];  [2];  [2];  [3];  [2]
  1. Ningbo University (China); Michigan State University, East Lansing, MI (United States)
  2. Michigan State University, East Lansing, MI (United States)
  3. Weizmann Institute of Science, Rehovot (Israel)
  4. Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
  5. Zhejiang University of Technology, Hangzhou (China)
Searching for Kagome magnets with novel magnetic and electronic properties has been attracting significant efforts recently. Here, the magnetic, electronic, and thermoelectric properties of Fe3Ge single crystals with Fe atoms forming a slightly distorted Kagome lattice are reported. It is shown that Fe3Ge exhibits a large anomalous Hall effect and anomalous Nernst effect. The observed anomalous transverse thermoelectric conductivity $$|α^A_{xz}|$$ reaches ≈4.6 A m−1 K−1, which is larger than the conventional ferromagnets and most of the topological ferromagnets reported in literature. The first-principles calculations suggest that these exceptional transport properties are dominated by the intrinsic mechanism, which highlights the significant contribution of the Berry curvature of massive Dirac gaps in the momentum space. Additionally, a topological Hall resistivity of 0.9 µΩ cm and a topological Nernst coefficient of 1.2 µV K−1 are also observed, which are presumably ascribed to the Berry phase associated with the field-induced non-zero scalar spin chirality. These features highlight the synergic effects of the Berry phases in both momentum space and real space of Fe3Ge, which render it an excellent candidate for room-temperature thermoelectric applications based on transverse transport.
Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF)
Grant/Contract Number:
AC05-00OR22725; SC0019120; SC0019259; SC0023648
OSTI ID:
3012514
Journal Information:
Advanced Functional Materials, Journal Name: Advanced Functional Materials; ISSN 1616-3028; ISSN 1616-301X
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English

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