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

• Published in: arXiv.org 2023-11
• Main Authors: Park, Pyeongjae, Cho, Woonghee, Kim, Chaebin, An, Yeochan, Yoon-Gu, Kang, Avdeev, Maxim, Sibille, Romain, Iida, Kazuki, Kajimoto, Ryoichi, Lee, Ki Hoon, Ju, Woori, En-Jin, Cho, Han-Jin, Noh, Han, Myung Joon, Shang-Shun Zhang, Batista, Cristian D, Park, Je-Geun
• Format: Article
• Language: English
• Subjects: Antiferromagnetism; Frustrated magnetism; Hall effect; Hypothetical particles; Inelastic scattering; Insulation; Neutron scattering; Particle theory; Scattering cross sections; Structure factor
• ISSN: 2331-8422
• DOI: 10.48550/arxiv.2303.03760

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 {\sigma}_{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.