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Peer-reviewedCC BY-NC-NDNature communications

Noncollinear kagome magnet driven by giant antisymmetric exchange.

  • David W Tam1,2,3
  • Romain Sibille4
  • Thomas Mazet5
  • Bertrand Roessli4
  • Andrea Piovano6
  • Bernard Malaman5
  • Dariusz Jakub Gawryluk4
  • Loïc Roduit4
  • YouGuo Shi7,8,9
  • Xiuliang Yuan7
  • Alexandra A Turrini4,10
  • Lukas Keller4
1 more authors
  • Yona Soh11
11 affiliations
  1. 1PSI Center for Neutron and Muon Sciences, Villigen, Switzerland. [email protected].
  2. 2Department of Applied Physics, KTH Royal Institute of Technology, Stockholm, Sweden. [email protected].
  3. 3Institut Laue-Langevin, 38042, Grenoble, France. [email protected].
  4. 4PSI Center for Neutron and Muon Sciences, Villigen, Switzerland.
  5. 5Institut Jean Lamour, UMR 7198, CNRS, Université de Lorraine, Nancy, France.
  6. 6Institut Laue-Langevin, 38042, Grenoble, France.
  7. 7Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, China.
  8. 8School of Physical Sciences, University of Chinese Academy of Sciences, Beijing, China.
  9. 9Songshan Lake Materials Laboratory, Dongguan, China.
  10. 10Laboratory for Quantum Magnetism, Institute of Physics, École Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland.
  11. 11Paul Scherrer Institut, Villigen, Switzerland. [email protected].
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Abstract

Kagome lattices host exotic phenomena such as quantum spin liquids, topological Weyl nodes, and flat bands. The kagome ferromagnet Co₃Sn₂S₂ has been a focus of debate due to conflicting reports on its magnetic character. Here, using weakly perturbative probes-primarily neutron scattering and Mössbauer spectroscopy-we determine its ground state and magnetic Hamiltonian. The spin wave spectrum is reproduced by a simple Hamiltonian dominated by a large in-plane nearest-neighbor Heisenberg interaction J and an antisymmetric Dzyaloshinskii-Moriya interaction that is roughly one third of J. This Hamiltonian yields a canted, noncollinear ferromagnetic ground state with an umbrella-type structure, which our data show to be the true ground state at all temperatures below TC. Additionally, the spin susceptibility above TC exhibits a reduced critical exponent, akin to other spin-anisotropic systems. Our findings explain the unconventional magnetism in Co₃Sn₂S₂, including the giant anomalous Hall effect and the origin of chiral phonons.

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Cite

BibTeXRIS
BibTeX
@article{tam2026noncollinear,
  title = {{Noncollinear kagome magnet driven by giant antisymmetric exchange.}},
  author = {David W Tam and Romain Sibille and Thomas Mazet and Bertrand Roessli and Andrea Piovano and Bernard Malaman and Dariusz Jakub Gawryluk and Loïc Roduit and YouGuo Shi and Xiuliang Yuan and Alexandra A Turrini and Lukas Keller and Yona Soh},
  journal = {Nature communications},
  year = {2026},
  month = sep,
  doi = {10.1038/s41467-026-77000-6},
  url = {https://europepmc.org/article/MED/42901899},
  note = {CC BY-NC-ND},
}
RIS
TY  - JOUR
TI  - Noncollinear kagome magnet driven by giant antisymmetric exchange.
AU  - David W Tam
AU  - Romain Sibille
AU  - Thomas Mazet
AU  - Bertrand Roessli
AU  - Andrea Piovano
AU  - Bernard Malaman
AU  - Dariusz Jakub Gawryluk
AU  - Loïc Roduit
AU  - YouGuo Shi
AU  - Xiuliang Yuan
AU  - Alexandra A Turrini
AU  - Lukas Keller
AU  - Yona Soh
PY  - 2026
DA  - 2026/09/03
JO  - Nature communications
DO  - 10.1038/s41467-026-77000-6
UR  - https://europepmc.org/article/MED/42901899
AB  - Kagome lattices host exotic phenomena such as quantum spin liquids, topological Weyl nodes, and flat bands. The kagome ferromagnet Co₃Sn₂S₂ has been a focus of debate due to conflicting reports on its magnetic character. Here, using weakly perturbative probes-primarily neutron scattering and Mössbauer spectroscopy-we determine its ground state and magnetic Hamiltonian. The spin wave spectrum is reproduced by a simple Hamiltonian dominated by a large in-plane nearest-neighbor Heisenberg interaction J and an antisymmetric Dzyaloshinskii-Moriya interaction that is roughly one third of J. This Hamiltonian yields a canted, noncollinear ferromagnetic ground state with an umbrella-type structure, which our data show to be the true ground state at all temperatures below TC. Additionally, the spin susceptibility above TC exhibits a reduced critical exponent, akin to other spin-anisotropic systems. Our findings explain the unconventional magnetism in Co₃Sn₂S₂, including the giant anomalous Hall effect and the origin of chiral phonons.
SN  - 2041-1723
ER  -