Electronic structure study of A(Fe,Ni)₆Ge₆ Kagome metals using angle-resolved photoemission spectroscopy

Kagome metals have gained significant attention for their diverse quantum phases driven by the interplay between lattice, orbital, and spin orders. Recently, a new family of A(Fe,Ni)₆Ge₆ Kagome metals has been synthesized, featuring a crystal structure based on FeGe, a correlated Kagome antiferromagnet with charge density wave (CDW) order. Theoretical studies predict instabilities in these materials that could lead to translational and rotational symmetry-breaking orders [1], though no experimental investigations have been conducted. Here, we present an electronic structure study of A(Fe,Ni)₆Ge₆ using angle-resolved photoemission spectroscopy (ARPES), focusing on the signatures of these symmetry-breaking orders in their bands. Our work aims to open new avenues for exploring the rich properties of A(Fe,Ni)₆Ge₆ Kagome materials, such as flat band, van Hove singularity, magnetism, CDW, nematicity, and their intriguing interactions.