Three-dimensional mapping of the altermagnetic spin splitting in CrSb

Guowei Yang, Zhanghuan Li, Sai Yang, Jiyuan Li, Hao Zheng, Weifan Zhu, Ze Pan, Yifu Xu, Saizheng Cao, Wenxuan Zhao, Anupam Jana, Jiawen Zhang, Mao Ye, Yu Song, Lun-Hui Hu, Lexian Yang, Jun Fujii, Ivana Vobornik, Ming Shi, Huiqiu Yuan, Yongjun Zhang (), Yuanfeng Xu () and Yang Liu ()
Additional contact information
Guowei Yang: Zhejiang University
Zhanghuan Li: Chinese Academy of Sciences
Sai Yang: Hubei Normal University
Jiyuan Li: Hubei Normal University
Hao Zheng: Zhejiang University
Weifan Zhu: Zhejiang University
Ze Pan: Zhejiang University
Yifu Xu: Zhejiang University
Saizheng Cao: Zhejiang University
Wenxuan Zhao: Tsinghua University
Anupam Jana: Area Science Park-Basovizza
Jiawen Zhang: Zhejiang University
Mao Ye: Chinese Academy of Sciences
Yu Song: Zhejiang University
Lun-Hui Hu: Zhejiang University
Lexian Yang: Tsinghua University
Jun Fujii: Area Science Park-Basovizza
Ivana Vobornik: Area Science Park-Basovizza
Ming Shi: Zhejiang University
Huiqiu Yuan: Zhejiang University
Yongjun Zhang: Hubei Normal University
Yuanfeng Xu: Zhejiang University
Yang Liu: Zhejiang University

Nature Communications, 2025, vol. 16, issue 1, 1-9

Abstract: Abstract 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 TN (up to 705 K) and simple spin configuration, paves the way for exploring emergent phenomena and spintronic applications based on altermagnets.

Date: 2025
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DOI: 10.1038/s41467-025-56647-7

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