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Updated: Sep 19, 2025
Author Spotlight: Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks
Published on: June 9, 2023
Electron-Correlation-Induced Charge Density Waves and Magnetism-Related Energy Gap in Kagome FeGe Unraveled by
Xiaoqiu Yuan1, Wanru Ma2, Chengfeng Yu1
1Information Materials and Intelligent Sensing Laboratory of Anhui Province, Institutes of Physical Science and Information Technology, Anhui University, Hefei, Anhui 230601, China.
Abstract:
As the first magnetic Kagome material exhibiting charge density waves (CDWs), FeGe has garnered widespread research interest. In this work, we utilized low-temperature, high-magnetic-field scanning tunneling microscopy/spectroscopy to investigate both the CDWs and magnetism in FeGe. We observed coexisting short-range 2 × 2 and √3 × √3 CDW patterns, which are spatially exclusive with Ge1 site defects in the Kagome layer, suggesting that CDW formation is related to Ge1-dimerization involving electron correlations. Using a spin-polarized tip, we identified the A-type antiferromagnetic (AFM) structure, which undergoes a gradual spin-flop transition with increasing magnetic field. The gap opened at the Fermi energy evolves with the magnetic structure transition but remains insensitive to the presence of CDWs. These results underscore the role of electron correlations in the formation of the CDWs in FeGe and identify the magnetism origin of the low-energy gap, revealing a compatibility between AFM order and CDWs in FeGe.
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