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Topological Nernst effect, anomalous Nernst effect, and anomalous thermal Hall effect in the Dirac semimetal Fe 3 Sn 2

Journal Article · · Physical Review B
 [1];  [2];  [3]
  1. Michigan State Univ., East Lansing, MI (United States); Michigan State University
  2. Michigan State Univ., East Lansing, MI (United States); Southeast Univ., Nanjing (China)
  3. Michigan State Univ., East Lansing, MI (United States)
Topological semimetals have been a focal point of research in recent years. One of the salient characters of topological semimetals is the anomalous Hall effect arising from the nontrivial momentum-space Berry phase. In contrast, anomalous transverse thermoelectric coefficient and thermal Hall effect are much less explored up to date. In this paper, we report thermoelectric and thermal transport properties of Fe3Sn2, a prototypical Dirac semimetal. We find that Fe3Sn2 exhibits large topological Nernst effect which is associated with the non-zero spin chirality of the skyrmion bubble phase. Furthermore, Fe3Sn2 shows prominent anomalous thermal Hall effect and anomalous Nernst effect with features similar to the anomalous Hall effect. The anomalous Nernst signal is about 2.1 μV/K at room temperature, which is comparable to the largest value reported thus far. These results highlight the synergic effects of Berry phase in both real space and momentum space of Fe3Sn2, and this study demonstrates an effective strategy of investigating topological materials by measuring their transverse thermal and thermoelectric responses.
Research Organization:
Michigan State Univ., East Lansing, MI (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division
Grant/Contract Number:
SC0019259
OSTI ID:
1780856
Journal Information:
Physical Review B, Journal Name: Physical Review B Journal Issue: 20 Vol. 103; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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