Tunable magnetism and band structure in kagome materials RETi3Bi4 family with weak interlayer interactions.

作者：Jing-Kun Guo, Liqin Zhou, Jianyang Ding, Gexing Qu, Zhengtai Liu, Yu-Hao Du, Hen Zhang, Jiajun Li, Yiying Zhang, F. Zhou, Wuyi Qi, Minghui Cui, Yongxin Zhang, F. Guo, Tianqi Wang, F. Fei, Yaobo Huang, T. Qian, D. Shen, You Song, H. Weng, F. Song · 发表于：Science Bulletin · 年份：2023 · DOI：10.1016/j.scib.2024.06.036 · 被引用次数：19 · 研究领域：Physics、Medicine

Kagome materials have attracted a surge of research interest recently, especially for the ones combining with magnetism, and the ones with weak interlayer interactions which can fabricate thin devices. However, kagome materials combining both characters of magnetism and weak interlayer interactions are rare. Here we investigate a new family of titanium based kagome materials RETi3Bi4 (RE = Eu, Gd and Sm). The flakes of nanometer thickness of RETi3Bi4 can be obtained by exfoliation due to the weak interlayer interactions. According to magnetic measurements, out-of-plane ferromagnetism, out-of-plane anti-ferromagnetism, and in-plane ferromagnetism are formed for RE = Eu, Gd, and Sm respectively. The magnetic orders are simple and the saturation magnetizations can be relatively large since the rare earth elements solely provide the magnetic moments. Further by angle-resolved photoemission spectroscopy (ARPES) and first-principles calculations, the electronic structures of RETi3Bi4 are investigated. The ARPES results are consistent with the calculations, indicating the bands characteristic with kagome sublattice in RETi3Bi4. We expect these materials to be promising candidates for observation of the exotic magnetic topological phases and the related topological quantum transport studies.