反铁磁性
凝聚态物理
Atom(片上系统)
近藤效应
物理
近藤绝缘体
近藤模型
费米能级
电子
量子力学
计算机科学
嵌入式系统
作者
Xingyu Ji,Qin Liu,Wei Feng,Yun Zhang,Qiuyun Chen,Yi Liu,Qunqing Hao,Jian Wu,Ziwei Xue,Xiegang Zhu,Qiang Zhang,Xuebing Luo,Shiyong Tan,Xinchun Lai
出处
期刊:Physical review
日期:2024-02-26
卷期号:109 (7)
标识
DOI:10.1103/physrevb.109.075158
摘要
Recent studies on the electronic structures of the $5f$-electron based antiferromagnetic compounds, i.e., uranium dipnictides, have aroused widespread interest in the complex interplay among different channels of interactions, such as Kondo entanglement and antiferromagnetic ordering. Here, we use scanning tunneling microscopy/spectroscopy to explore the complex low-energy excitations in the $5f$-electron based antiferromagnet $\mathrm{U}{\mathrm{As}}_{2}$. The crystal-field excitations are revealed as peaks above the Fermi level in the $\mathrm{d}I/\mathrm{d}V$ spectra. Temperature-dependent spectroscopic measurements find that Kondo resonance and antiferromagnetic order are manifested as two peaks below the Fermi level, demonstrating that Kondo coherence can be undisturbedly established in the antiferromagnetic phase. The crystal-field excitations, Kondo resonance, and antiferromagnetic state are all locally altered by the presence of As-atom vacancies at the atomic scale and these phenomena prove that the nonmagnetic atom vacancy has a strong influence on low-energy excitations in heavy fermion compounds.
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