Large anomalous Nernst effect and nodal plane in an iron-based kagome ferromagnet

Chen, Taishi; Minami, Susumu; Sakai, Akito; Wang, Yangming; Feng, Zili; Nomoto, Takuya; Hirayama, Motoaki; Ishii, Rieko; Koretsune, Takashi; Arita, Ryotaro; Nakatsuji, Satoru

doi:10.1126/sciadv.abk1480

Large anomalous Nernst effect and nodal plane in an iron-based kagome ferromagnet

Journal Article · Fri Jan 14 00:00:00 EST 2022 · Science Advances

DOI:https://doi.org/10.1126/sciadv.abk1480· OSTI ID:1904345

^[1]; ^[2]; Sakai, Akito ^[3]; Wang, Yangming ^[2]; ^[2]; ^[2]; ^[4]; Ishii, Rieko ^[2]; ^[5]; ^[6]; ^[7]

Univ. of Tokyo (Japan); Southeast Univ., Nanjing (China); OSTI
Univ. of Tokyo (Japan)
Univ. of Tokyo (Japan); Japan Science and Technology Agency (JST), Saitama (Japan)
Univ. of Tokyo (Japan); RIKEN Center for Emergent Matter Science (CEMS), Wako (Japan)
Tohoku Univ., Sendai (Japan)
Japan Science and Technology Agency (JST), Saitama (Japan); Univ. of Tokyo (Japan); RIKEN Center for Emergent Matter Science (CEMS), Wako (Japan)
Univ. of Tokyo (Japan); Japan Science and Technology Agency (JST), Saitama (Japan); Johns Hopkins Univ., Baltimore, MD (United States)

Anomalous Nernst effect (ANE), converting a heat flow to transverse electric voltage, originates from the Berry phase of electronic wave function near the Fermi energy E_F. Thus, the ANE provides a sensitive probe to detect a topological state that produces large Berry curvature. In addition, a magnet that exhibits a large ANE using low-cost and safe elements will be useful to develop a novel energy harvesting technology. Here, we report our observation of a high ANE exceeding 3 microvolts per kelvin above room temperature in the kagome ferromagnet Fe₃Sn with the Curie temperature of 760 kelvin. Our theoretical analysis clarifies that a “nodal plane” produces a flat hexagonal frame with strongly enhanced Berry curvature, resulting in the large ANE. Our discovery of the large ANE in Fe₃Sn opens the path for the previously unexplored functionality of flat degenerate electronic states and for developing flexible film thermopile and heat current sensors.

View Accepted Manuscript (DOE)

Research Organization:: Energy Frontier Research Centers (EFRC) (United States). Institute for Quantum Matter (IQM); Johns Hopkins Univ., Baltimore, MD (United States)

Sponsoring Organization:: Japan Science and Technology Agency (JST); Ministry of Education, Culture, Sports, Science, and Technology of Japan; USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0019331

OSTI ID:: 1904345

Journal Information:: Science Advances, Journal Name: Science Advances Journal Issue: 2 Vol. 8; ISSN 2375-2548

Publisher:: AAASCopyright Statement

Country of Publication:: United States

Language:: English

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