Tetrahedral triple-Q magnetic ordering and large spontaneous Hall conductivity in the metallic triangular antiferromagnet Co1/3TaS2

Pyeongjae Park, Woonghee Cho, Chaebin Kim, Yeochan An, Yoon-Gu Kang, Maxim Avdeev, Romain Sibille, Kazuki Iida, Ryoichi Kajimoto, Ki Hoon Lee, Woori Ju, En-Jin Cho, Han-Jin Noh, Myung Joon Han, Shang-Shun Zhang, Cristian D. Batista () and Je-Geun Park ()
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Pyeongjae Park: Seoul National University
Woonghee Cho: Seoul National University
Chaebin Kim: Seoul National University
Yeochan An: Seoul National University
Yoon-Gu Kang: KAIST
Maxim Avdeev: Australian Nuclear Science and Technology Organisation (ANSTO)
Romain Sibille: Paul Scherrer Institut
Kazuki Iida: Comprehensive Research Organization for Science and Society (CROSS)
Ryoichi Kajimoto: J-PARC Center, Japan Atomic Energy Agency
Ki Hoon Lee: Incheon National University
Woori Ju: Chonnam National University
En-Jin Cho: Chonnam National University
Han-Jin Noh: Chonnam National University
Myung Joon Han: KAIST
Shang-Shun Zhang: University of Minnesota
Cristian D. Batista: The University of Tennessee
Je-Geun Park: Seoul National University

Nature Communications, 2023, vol. 14, issue 1, 1-9

Abstract: Abstract The triangular lattice antiferromagnet (TLAF) has been the standard paradigm of frustrated magnetism for several decades. The most common magnetic ordering in insulating TLAFs is the 120° structure. However, a new triple-Q chiral ordering can emerge in metallic TLAFs, representing the short wavelength limit of magnetic skyrmion crystals. We report the metallic TLAF Co1/3TaS2 as the first example of tetrahedral triple-Q magnetic ordering with the associated topological Hall effect (non-zero σxy(H = 0)). We also present a theoretical framework that describes the emergence of this magnetic ground state, which is further supported by the electronic structure measured by angle-resolved photoemission spectroscopy. Additionally, our measurements of the inelastic neutron scattering cross section are consistent with the calculated dynamical structure factor of the tetrahedral triple-Q state.

Date: 2023
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DOI: 10.1038/s41467-023-43853-4

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