Luo Parry Pei-Rui, Hsu Hung-Chang, Lin Li-Sheng, Chen Hao-Yu, Xie Xiang-Yu, Kuo Chia-Nung, Chou Jyh-Pin, Lue Chin-Shan, Chiu Ya-Ping
Department of Physics, National Taiwan University, Taipei, 106319, Taiwan.
School of Medicine, National Taiwan University, Taipei, 100233, Taiwan.
Nat Commun. 2025 May 31;16(1):5080. doi: 10.1038/s41467-025-60301-7.
d-electronic heavy fermion systems have sparked interest in exploring the connection between electronic and spin degrees of freedom in Kondo systems. Nevertheless, the coexistence of charge order on a Kondo lattice has yet to be discovered. FeGeTe, a two-dimensional ferromagnet, intriguingly provides a promising avenue to bridge the gap, as this d-electronic Kondo system facilitates the ordering of charge and magnetic behaviors due to the influence of itinerant magnetism on local electronic band structure. Here, we present direct evidence for the coherent interplay between Kondo interaction and charge density wave (CDW) phenomena in FeGeTe using scanning tunneling microscopy/spectroscopy (STM/STS). From the electronic structure, we observe a modulation accompanied by phase inversion, indicative of CDW. Concurrently, the presence of a Fano-like peak near the Fermi level corroborates the Kondo lattice behavior. Furthermore, formations of Kondo holes at defect sites underscore the influence of Kondo interaction on local electronic structures. To unveil the robust correlation between CDW and Kondo lattice behavior, we analyze the CDW modulation and develop a theoretical model to interpret their robust coupling. Our findings advance the understanding of Kondo physics in d-electronic ferromagnetic systems and highlight FeGeTe as a promising platform for exploring low-dimensional magnetism.
d 电子重费米子系统引发了人们对探索近藤系统中电子自由度和自旋自由度之间联系的兴趣。然而，近藤晶格上电荷序的共存尚未被发现。二维铁磁体 FeGeTe 有趣地提供了一条弥合差距的有前途的途径，因为这个 d 电子近藤系统由于巡游磁性对局部电子能带结构的影响而促进了电荷和磁行为的有序化。在这里，我们使用扫描隧道显微镜/能谱（STM/STS）展示了 FeGeTe 中近藤相互作用与电荷密度波（CDW）现象之间相干相互作用的直接证据。从电子结构中，我们观察到伴随着相位反转的调制，这表明存在 CDW。同时，费米能级附近类似法诺峰的存在证实了近藤晶格行为。此外，缺陷位点处近藤空穴的形成突出了近藤相互作用对局部电子结构的影响。为了揭示 CDW 与近藤晶格行为之间的强相关性，我们分析了 CDW 调制并开发了一个理论模型来解释它们的强耦合。我们的发现推进了对 d 电子铁磁系统中近藤物理的理解，并突出了 FeGeTe 作为探索低维磁性的有前途的平台。
