Electronic structure of a topological Kondo magnet

Magnetic topological semimetals have recently emerged as a topic of central interest in condensed matter physics, but have mostly been explored in weakly-correlated systems. Here, we report the topological electronic structure of a new strong-correlated magnet, through Angular-Resolved Photoemission Spectroscopy (ARPES) combined with DFT+DMFT calculations. Remarkably, we experimentally observe a strong Kondo coherence peak below magnetic transition temperature, which indicates the coexistence of the Kondo lattice and magnetism in the system. We further observe band crossings between the heavy band and itinerant band. DFT+DMFT calculation shows the non-trivial topology of the band crossings. Through comparing with the electronic structure of the similar compound that doesn’t have Kondo physics, we demonstrate the crucial role of Kondo-driven topological electronic structure in understanding the exotic transport responses of the compound.