Yang Guowei, Li Zhanghuan, Yang Sai, Li Jiyuan, Zheng Hao, Zhu Weifan, Pan Ze, Xu Yifu, Cao Saizheng, Zhao Wenxuan, Jana Anupam, Zhang Jiawen, Ye Mao, Song Yu, Hu Lun-Hui, Yang Lexian, Fujii Jun, Vobornik Ivana, Shi Ming, Yuan Huiqiu, Zhang Yongjun, Xu Yuanfeng, Liu Yang
Center for Correlated Matter and School of Physics, Zhejiang University, Hangzhou, China.
Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, China.
Nat Commun. 2025 Feb 7;16(1):1442. doi: 10.1038/s41467-025-56647-7.
Altermagnetism, a kind of collinear magnetism that is characterized by a momentum-dependent band and spin splitting without net magnetization, has recently attracted considerable interest. Finding altermagnetic materials with large splitting near the Fermi level necessarily requires three-dimensional k-space mapping. While this is crucial for spintronic applications and emergent phenomena, it remains challenging. Here, using synchrotron-based angle-resolved photoemission spectroscopy (ARPES), spin-resolved ARPES and model calculations, we uncover a large altermagnetic splitting, up to ~1.0 eV, near the Fermi level in CrSb. We verify its bulk-type g-wave altermagnetism through systematic three-dimensional k-space mapping, which unambiguously reveals the altermagnetic symmetry and associated nodal planes. Spin-resolved ARPES measurements further verify the spin polarizations of the split bands near Fermi level. Tight-binding model analysis indicates that the large altermagnetic splitting arises from strong third-nearest-neighbor hopping mediated by Sb ions. The large band/spin splitting near Fermi level in metallic CrSb, together with its high T (up to 705 K) and simple spin configuration, paves the way for exploring emergent phenomena and spintronic applications based on altermagnets.
交替磁性是一种共线磁性，其特征在于动量依赖的能带和自旋分裂且无净磁化，最近引起了相当大的关注。要找到在费米能级附近具有大分裂的交替磁性材料，必然需要进行三维k空间映射。虽然这对于自旋电子学应用和新兴现象至关重要，但仍然具有挑战性。在这里，我们使用基于同步加速器的角分辨光电子能谱（ARPES）、自旋分辨ARPES和模型计算，在CrSb中费米能级附近发现了高达约1.0 eV的大交替磁分裂。我们通过系统的三维k空间映射验证了其体类型的g波交替磁性，这明确揭示了交替磁对称性和相关的节面。自旋分辨ARPES测量进一步验证了费米能级附近分裂能带的自旋极化。紧束缚模型分析表明，大的交替磁分裂源于由Sb离子介导的强第三近邻跳跃。金属CrSb中费米能级附近的大能带/自旋分裂，连同其高T（高达705 K）和简单的自旋构型，为探索基于交替磁体的新兴现象和自旋电子学应用铺平了道路。
