中央研究院 Logo

Abstract

This study investigates the coexistence and coupling of Kondo interactions with charge density wave (CDW) phenomena in the two-dimensional metallic ferromagnet Fe5GeTe2 using scanning tunneling microscopy/spectroscopy (STM/STS). Through atomic-resolution STM imaging, we observe a √3×√3 R30° superstructure accompanied by phase inversion, suggesting the emergence of CDW. Concurrently, STS measurements unveil a Fano-like peak near the Fermi level, indicative of Kondo resonance, thereby corroborating the presence of a Kondo lattice. Furthermore, the formation of Kondo holes at defect sites underscores the influence of Kondo interaction on local electronic structures. Subsequent analyses of the CDW modulation unveil a robust correlation between CDW and Kondo lattice behavior. Our experimental results provide direct evidence of the simultaneous stabilization of CDW and Kondo lattice behaviors. These findings not only advance our understanding of Kondo physics in d-electron ferromagnetic systems but also highlight Fe5GeTe2 as a promising platform for exploring low-dimensional magnetism and spintronics applications.[1]

[1] Pei-Rui Luo, Hung-Chang Hsu, Li-Sheng Lin, Hao-Yu Chen, Xiang-Yu Xie, Chia-Nung Kuo, Jyh-Pin Chou*, Chin-Shan Lue*, Ya-Ping Chiu*, Nature Communications 16, 5080 (2025).