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arXiv · 2509.21303

Topological nontrivial berry phase in altermagnet CrSb

Jianhua Du·Xin Peng·Yuzhi Wang·Shengnan Zhang·Yuran Sun·Chunxiang Wu·Tingyu Zhou·Le Liu·Hangdong Wang·Jinhu Yang·Bin Chen·Chuanying Xi·Zhiwei Jiao·Quansheng Wu·Minghu Fang
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Abstract

The study of topological properties in magnetic materials has long been one of the forefront research areas in condensed matter physics. CrSb, as a prototypical candidate material for altermagnetism, has attracted significant attention due to its unique magnetic properties. This system provides a novel platform for exploring the intrinsic relationship between altermagnetic order and exotic topological states. In this study, we combine systematic electrical transport experiments with first-principles calculations to investigate the possible realization mechanisms of topological semimetal states in CrSb and their manifestations in quantum transport phenomena. Our high field magneto-transport measurements reveal that the magnetoresistance of CrSb exhibits no sign of saturation up to 35 T, following a distinct power-law dependence with an exponent of 1.48. The nonlinear Hall resistivity further indicates a multiband charge transport mechanism. Under high magnetic fields, we observe pronounced Shubnikov-de Haas (SdH) quantum oscillations and discernible Zeeman-effect-induced band splitting at 1.6 K. Systematic Fermi surface and band calculations combined with Berry phase analysis confirm the nontrivial topological character of this material (with a Berry phase approaching π). These findings not only provide crucial experimental evidence for understanding the electronic structure of CrSb, but also establish an important foundation for investigating topological quantum states in altermagnets.

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Jianhua Du, Xin Peng, Yuzhi Wang, Shengnan Zhang, Yuran Sun, Chunxiang Wu, Tingyu Zhou, Le Liu, Hangdong Wang, Jinhu Yang, Bin Chen, Chuanying Xi, Zhiwei Jiao, Quansheng Wu, Minghu Fang. 2025-09-25. Topological nontrivial berry phase in altermagnet CrSb. https://doi.org/10.1007/s11433-026-2957-5

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