Unraveling Intertwined Orders in the Strongly Correlated Kagome Metal CsCr₃Sb₅

Correlated kagome materials exhibit a compelling interplay between lattice geometry, electron correlation, and topology. In particular, the flat bands near the Fermi level provide a fertile playground for novel many-body states. By substituting Vanadium with Chromium, the newly discovered kagome metal CsCr₃Sb₅ offers a unique and rich platform for this research, as its multi-orbital flat bands at the Fermi surface result in a complex interplay of pressurized superconductivity, antiferromagnetism, a structural phase transition, and density wave orders. Here, we use high-resolution angle-resolved photoemission spectroscopy and ab-initio calculations to identify it as a Hund's metal with incipient flat bands near the Fermi level. Moreover, using ultrafast optical techniques, we provide strong spectroscopic evidence for CDW transition and rotational symmetry breaking that manifests as a three-state Potts-type nematicity. The elastoresistance measurements further confirm an electron nematic order, akin to phenomena seen in certain iron-based superconductors. Our work provides an electronic basis for understanding its novel properties compared to the weakly correlated AV₃Sb₅, offering new insights into the interactions between multiple elementary excitations in strongly correlated systems.