Electronic Transport and Magnetoresistance in a Transition-Metal-Based Kagome Metal

The RT₆X₆ family of transition-metal-based Kagome metals (where R = rare earth elements, T = transition metals, and X = Sn or Ge) has attracted considerable interest due to its potential to reveal unique magnetic behaviors and nontrivial topological properties. These phenomena emerge from the interplay between geometry, topology, and electronic correlations. In this work, we investigate the electrical transport properties of a novel Kagome magnet exhibiting antiferromagnetic long-range order around 3 K. Our measurements reveal both positive and negative magnetoresistance effects, with a pronounced peak in negative magnetoresistance occurring at a characteristic transition temperature, Tp. This peak tends toward zero at high temperatures (T>Tp​) and rapidly diminishes at temperatures below Tp. The suppression of the transition temperature with increasing applied magnetic field further emphasizes the coupling between the magnetic and electronic degrees of freedom in this system. These findings point toward complex magneto-electronic interactions that may underlie the exotic quantum phases associated with the Kagome lattice in this transition-metal-based system.