Authors
Alahmed, Laith; Zhang, Xiaoqian; Wen, Jiajia; Xiong, Yuzan; Li, Yi; Zhang, Li-chuan; Lux, F.; Freimuth, Frank; Mahdi, Muntasir; Mokrousov, Yuri; Novosad, Valentine; Kwok, Wai-Kwong; Yu, Dapeng; Zhang, Wei; Lee, Young S. ; Li, Peng
Abstract
We explore spin dynamics in Cu(1,3-bdc), a quasi-2D topological magnon insulator. The results show that the thermal evolution of the Lande g factor (g) is anisotropic: gin-plane decreases while g(out-of-plane) increases with increasing temperature T. Moreover, the anisotropy of the g factor (Delta g) and the anisotropy of saturation magnetization (Delta M-s) 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).