Gapped nodal planes and large topological Nernst effect in the chiral lattice antiferromagnet CoNb3S6

Nguyen Duy Khanh (), Susumu Minami, Moritz M. Hirschmann (), Takuya Nomoto, Ming-Chun Jiang, Rinsuke Yamada, Niclas Heinsdorf, Daiki Yamaguchi, Yudai Hayashi, Yoshihiro Okamura, Hikaru Watanabe, Guang-Yu Guo, Youtarou Takahashi, Shinichiro Seki, Yasujiro Taguchi, Yoshinori Tokura, Ryotaro Arita and Max Hirschberger ()
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Nguyen Duy Khanh: RIKEN Center for Emergent Matter Science (CEMS)
Susumu Minami: RIKEN Center for Emergent Matter Science (CEMS)
Moritz M. Hirschmann: RIKEN Center for Emergent Matter Science (CEMS)
Takuya Nomoto: Tokyo Metropolitan University
Ming-Chun Jiang: RIKEN Center for Emergent Matter Science (CEMS)
Rinsuke Yamada: The University of Tokyo
Niclas Heinsdorf: University of British Columbia
Daiki Yamaguchi: The University of Tokyo
Yudai Hayashi: The University of Tokyo
Yoshihiro Okamura: RIKEN Center for Emergent Matter Science (CEMS)
Hikaru Watanabe: The University of Tokyo
Guang-Yu Guo: National Taiwan University
Youtarou Takahashi: RIKEN Center for Emergent Matter Science (CEMS)
Shinichiro Seki: The University of Tokyo
Yasujiro Taguchi: RIKEN Center for Emergent Matter Science (CEMS)
Yoshinori Tokura: RIKEN Center for Emergent Matter Science (CEMS)
Ryotaro Arita: RIKEN Center for Emergent Matter Science (CEMS)
Max Hirschberger: RIKEN Center for Emergent Matter Science (CEMS)

Nature Communications, 2025, vol. 16, issue 1, 1-10

Abstract: Abstract The electronic structure of compensated antiferromagnets (CAF) creates large functional responses, reminiscent of ferromagnets and suitable for data storage and readout, despite (nearly) net-zero spontaneous magnetization. Many experimental signatures of CAF - such as giant thermoelectric Nernst effects - should be enhanced when two or more electronic bands are nearly degenerate in vicinity of the Fermi energy. Here, we report a zero-field, thermoelectric Nernst effect >1 μV/K in the CAF CoNb3S6 despite its tiny net magnetization ~2 milli − μB. As drivers of the functional Nernst and Hall effects, we identify near-degeneracies of electron bands at the upper and lower boundaries of the first Brillouin zone, which are vestiges of nodal planes enforced by a screw axis symmetry in the paramagnetic state. Hot spots of emergent, or fictitious, magnetic fields are formed at the slightly gapped nodal planes. Taking into account more than six hundred Wannier orbitals, our theoretical model reproduces the observed spontaneous Nernst effect, emphasizes the role of proximate spin-space group symmetries and nodal planes for the electronic structure of CAF, and demonstrates the promise of ab-initio search for functional responses in a wide class of materials with reconstructed unit cells (supercells) due to spin or charge order.

Date: 2025
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DOI: 10.1038/s41467-025-57320-9

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