Park Pyeongjae, Cho Woonghee, Kim Chaebin, An Yeochan, Kang Yoon-Gu, Avdeev Maxim, Sibille Romain, Iida Kazuki, Kajimoto Ryoichi, Lee Ki Hoon, Ju Woori, Cho En-Jin, Noh Han-Jin, Han Myung Joon, Zhang Shang-Shun, Batista Cristian D, Park Je-Geun
Center for Quantum Materials, Seoul National University, Seoul, 08826, Republic of Korea.
Department of Physics & Astronomy, Seoul National University, Seoul, 08826, Republic of Korea.
Nat Commun. 2023 Dec 15;14(1):8346. doi: 10.1038/s41467-023-43853-4.
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 CoTaS as the first example of tetrahedral triple-Q magnetic ordering with the associated topological Hall effect (non-zero σ(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.
几十年来，三角晶格反铁磁体（TLAF）一直是受挫磁性的标准范例。绝缘TLAF中最常见的磁有序是120°结构。然而，金属TLAF中可以出现一种新的三Q手性有序，它代表了磁斯格明子晶体的短波长极限。我们报道了金属TLAF CoTaS，它是具有相关拓扑霍尔效应（σ(H = 0)不为零）的四面体三Q磁有序的首个实例。我们还提出了一个理论框架来描述这种磁性基态的出现，角分辨光电子能谱测量的电子结构进一步支持了这一框架。此外，我们对非弹性中子散射截面的测量结果与四面体三Q态的计算动态结构因子一致。
