2026-04-02 合肥物質科学研究院（HFIPS）
a, Kondo state near a Cr atom with complete breaking of spatial symmetry. b, Zero-bias conductance peak induced by a V vacancy. (Image by XIAO Yuhang)
＜関連情報＞
- https://english.hf.cas.cn/nr/bth/202604/t20260402_1155075.html
- https://www.nature.com/articles/s41567-026-03223-5
カゴメ超伝導体における対称性の破れた近藤遮蔽とゼロエネルギーモード Symmetry-broken Kondo screening and zero-energy mode in a kagome superconductor
Yubing Tu,Zongyuan Zhang,Wenjian Lu,Yuhang Xiao,Tao Han,Run Lv,Zhuying Wang,Zekun Zhou,Xingyuan Hou,Ning Hao,Zhenyu Wang,Xianhui Chen & Lei Shan
Nature Physics Published:24 March 2026
DOI:https://doi.org/10.1038/s41567-026-03223-5
Abstract
Quantum states of matter reorganize themselves in response to defects, giving rise to emergent local excitations that reflect the intrinsic properties of the underlying phases. Magnetic impurities, for example, generate Kondo screening in a Fermi liquid and Yu–Shiba–Rusinov states in a conventional superconductor. Yet, it remains unclear whether such impurities can trigger unconventional phenomena in the kagome superconductor AV3Sb5, where A represents K, Rb or Cs, which hosts a putative loop current order intertwined with its charge density wave. Here we demonstrate the emergence of Kondo resonance states near magnetic dopants in CsV3Sb5. Using scanning tunnelling microscopy, we find that the spatial structure of the Kondo screening near magnetic Cr impurities breaks all in-plane mirror symmetries of the kagome lattice. This symmetry breaking suggests the presence of an underlying electronic chirality arising from the proposed orbital loop current order. We also observe a pronounced zero-bias conductance peak arising from weakly magnetic V vacancies. These results provide insight into the coexistence and interplay of quantum states in kagome lattice compounds.
