中国科学技术大学 Peng Li--Home-- Evidence of Magnon-Mediated Orbital Magnetism in a Quasi-2D Topological Magnon Insulator

Evidence of Magnon-Mediated Orbital Magnetism in a Quasi-2D Topological Magnon Insulator

Release time:2022-11-12

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Key Words:: topological orbit moment, topological magnon insulator, Kagome magnet, magnon excitation, g-factor anisotropy

Abstract:: We explore spin dynamics in Cu(1,3-bdc), a quasi-2D topological magnon insulator. The results show that the thermal evolution of Land´e g-factor (g) is anisotropic: gin-plane reduces while gout-plane increases with increasing temperature T. Moreover, the anisotropy of the g-factor (∆g) and the anisotropy of saturation magnetization (∆Ms) are correlated below 4 K, but they diverge above 4 K. We show that the electronic orbital moment contributes to the g anisotropy at lower T, while the topological orbital moment induced by thermally excited spin chirality dictates the g anisotropy at higher T. Our work suggests an interplay among topology, spin chirality, and orbital magnetism in Cu(1,3-bdc).