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; Je-Geun Park

doi:10.1038/s41467-023-43853-4

Tetrahedral triple-Q magnetic ordering and large spontaneous Hall conductivity in the metallic triangular antiferromagnet Co_1/3TaS₂

Nat Commun. 2023 Dec 15;14(1):8346. doi: 10.1038/s41467-023-43853-4.

Authors

Pyeongjae Park^{1

2}, Woonghee Cho^{1

2}, Chaebin Kim^{1

2}, Yeochan An^{1

2}, Yoon-Gu Kang³, Maxim Avdeev^{4

5}, Romain Sibille⁶, Kazuki Iida⁷, Ryoichi Kajimoto⁸, Ki Hoon Lee⁹, Woori Ju¹⁰, En-Jin Cho¹⁰, Han-Jin Noh¹⁰, Myung Joon Han³, Shang-Shun Zhang¹¹, Cristian D Batista^{12

13}, Je-Geun Park^{14

15

16}

Affiliations

¹ Center for Quantum Materials, Seoul National University, Seoul, 08826, Republic of Korea.
² Department of Physics & Astronomy, Seoul National University, Seoul, 08826, Republic of Korea.
³ Department of Physics, KAIST, Daejeon, 34141, Republic of Korea.
⁴ Australian Nuclear Science and Technology Organisation (ANSTO), New Illawarra Road, Lucas Heights, NSW, 2234, Australia.
⁵ School of Chemistry, The University of Sydney, Sydney, NSW, 2006, Australia.
⁶ Laboratory for Neutron Scattering and Imaging, Paul Scherrer Institut, 5232, Villigen, Switzerland.
⁷ Comprehensive Research Organization for Science and Society (CROSS), Tokai, Ibaraki, 319-1106, Japan.
⁸ Materials and Life Science Division, J-PARC Center, Japan Atomic Energy Agency, Tokai, Ibaraki, 319-1195, Japan.
⁹ Department of Physics, Incheon National University, Incheon, 22012, Republic of Korea.
¹⁰ Department of Physics, Chonnam National University, Gwangju, 61186, Republic of Korea.
¹¹ School of Physics and Astronomy and William I. Fine Theoretical Physics Institute, University of Minnesota, Minneapolis, MN, 55455, USA.
¹² Department of Physics and Astronomy, The University of Tennessee, Knoxville, TN, 37996, USA. cbatist2@utk.edu.
¹³ Quantum Condensed Matter Division and Shull-Wollan Center, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA. cbatist2@utk.edu.
¹⁴ Center for Quantum Materials, Seoul National University, Seoul, 08826, Republic of Korea. jgpark10@snu.ac.kr.
¹⁵ Department of Physics & Astronomy, Seoul National University, Seoul, 08826, Republic of Korea. jgpark10@snu.ac.kr.
¹⁶ Institute of Applied Physics, Seoul National University, Seoul, 08826, Republic of Korea. jgpark10@snu.ac.kr.

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 Co_1/3TaS₂ as the first example of tetrahedral triple-Q magnetic ordering with the associated topological Hall effect (non-zero σ_xy(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.

Grants and funding

2020R1A3B2079375/National Research Foundation of Korea (NRF)