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arXiv 2606.02422cond-mat.str-elcond-mat.mtrl-sci
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局域4f电子抑制CeNiAsO中的p波交变磁性

Suppression of p-Wave Altermagnetism by Localized 4f Electrons in CeNiAsO

Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences（中国科学院物理研究所凝聚态物理北京国家实验室）；University of Chinese Academy of Sciences（中国科学院大学）；Condensed Matter Physics Data Center of Chinese Academy of Sciences（中国科学院凝聚态物理数据中心）；School of Nuclear Science and Technology, University of Science and Technology of China（中国科学技术大学核科学与技术学院）；Shanghai Synchrotron Radiation Facility, Shanghai Advanced Research Institute, Chinese Academy of Sciences（中国科学院上海高等研究院上海同步辐射光源）；National Key Laboratory of Materials for Integrated Circuits, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences（中国科学院上海微系统信息技术研究所集成电路材料国家重点实验室）；Technical Institute of Physics and Chemistry, Chinese Academy of Sciences（中国科学院化学物理研究所）；Songshan Lake Materials Laboratory（松山湖材料实验室）
Jiuxiang Zhang, Yueyang Sun, Honglin Zhou, Jumin Shi, Di Wu, Hongze Gu, Wenjin Mao, Hengrui Dong, Yu Xu, Yinghao Li, Ziling Cao, Taimin Miao, Bo Liang, Neng Cai… 展开作者

Jiuxiang Zhang, Yueyang Sun, Honglin Zhou, Jumin Shi, Di Wu, Hongze Gu, Wenjin Mao, Hengrui Dong, Yu Xu, Yinghao Li, Ziling Cao, Taimin Miao, Bo Liang, Neng Cai, Wenpei Zhu, Mingkai Xu, Jiaqi Chen, Chunhong Deng, Bo Liu, Xun Ma, Zhengtai Liu, Mao Ye, Shenjin Zhang, Zhimin Wang, Fengfeng Zhang, Feng Yang, Qinjun Peng, Zuyan Xu, Guodong Liu, Xintong Li, Hanqing Mao, Shiliang Li, Hongming Weng, Lin Zhao, X. J. Zhou

备注：
22 pages, 4 figures; Revised version corresponding to the journal-submitted manuscript; expanded ARPES analysis and revised discussion
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AI总结：

通过高分辨角分辨光电子能谱和第一性原理计算，发现CeNiAsO中局域化的4f电子将p波交换劈裂压低至实验分辨率以下，揭示了强关联f电子体系中p波磁性的新极限。

摘要：

交变磁性具有动量依赖的自旋劈裂和零净磁化，迄今主要在半弱或中等关联的d电子体系中研究。这种对称性允许的能带劈裂如何在重费米子材料中表现（其中磁交换与近藤关联竞争）仍不清楚。这里我们使用高分辨角分辨光电子能谱研究CeNiAsO，一种p波交变磁性的重费米子候选材料。尽管宏观特征与提出的p波磁有序一致，但我们发现跨越奈尔转变时，Ni 3d导带附近没有可分辨的费米能级p波交换劈裂。费米面映射和轨道分辨ARPES识别出低能电子结构主要由Ni 3d能带主导，而共振光电子能谱显示Ce 4f态保持高度局域化，残留c-f杂化。第一性原理计算进一步表明，未修正的巡游4f描述产生色散的Ce 4f能带和额外的费米面口袋，这些在实验中缺失，从而高估了低能c-f杂化和转移到Ni 3d能带的交换劈裂。当通过DFT+U纳入局域Ce 4f特征时，实验费米面拓扑得以恢复，Ni 3d衍生能带上的残余p波劈裂降至仅几毫电子伏，低于有效实验分辨率。这些结果将CeNiAsO识别为p波磁性的强关联f电子极限，其中局域4f电子抑制了弱关联图像预期的可观测单粒子能带劈裂特征。

英文摘要：

Altermagnetism, characterized by momentum-dependent spin splitting and zero net magnetization, has so far been explored mainly in weakly or moderately correlated d-electron systems. How symmetry-allowed altermagnetic band splitting manifests in heavy-fermion materials, where magnetic exchange competes with Kondo correlations, remains unclear. Here we use high-resolution angle-resolved photoemission spectroscopy (ARPES) to investigate CeNiAsO, a Kondo-lattice system that was predicted to be a candidate for p-wave altermagnetism. Fermi surface mapping and polarization-dependent ARPES show that the experimentally observed itinerant bands are mainly derived from Ni 3d orbitals, while resonant photoemission reveals that the Ce 4f states remain predominantly localized with residual c-f hybridization. Ultra-low-temperature measurements reveal no resolvable near-Fermi-level p-wave-like exchange splitting on the Ni 3d-derived conduction bands across the successive antiferromagnetic transitions. These experimental observations cannot be captured by an itinerant-4f band-structure description, which predicts a sizable p-wave splitting in the itinerant bands. When the localized Ce 4f character is incorporated, our band structure calculations indicate that the itinerant Ce 4f band weight is shifted away from the Fermi level and the p-wave-like splitting on the Ni 3d-derived bands is reduced to the few-meV scale. These results establish CeNiAsO as a strongly correlated f-electron setting in which the magnetic symmetry allows p-wave-like band splitting, but localized 4f electrons strongly suppress its observable itinerant single-particle signature.

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