In this study, we report the fractional magnetization plateaus and anomalous Hall effect in a newly synthesized kagome intermetallic magnet, $\mathrm{C}{\mathrm{e}}_3\mathrm{MgB}{\mathrm{i}}_5$. In this compound, the Ce atoms form a distorted kagome lattice, which allows for strong magnetic frustration by Ruderman-Kittel-Kasuya-Yosida interaction. Single-crystal neutron diffraction shows a nontrival magnetic ground state consisting of both all-in–all-out (aiao) spins and 2-in-1-out–1-in-2-out (2i1o–1i2o) spins below $T_{\mathrm{N}}=4.5\mathrm{K}$. By applying a magnetic field, two magnetization plateaus are found at $M/M_{\mathrm{s}}=1/3$ and $M/M_{\mathrm{s}}=1/2$. Transport measurements on $\mathrm{C}{\mathrm{e}}_3\mathrm{MgB}{\mathrm{i}}_5$ unveil a pronounced nonmonotonic magnetoresistance and a significant anomalous Hall effect, which are indicative of a strong correlation between its magnetic and electronic properties. Meanwhile, an obvious Kondo effect is observed in $\mathrm{C}{\mathrm{e}}_3\mathrm{MgB}{\mathrm{i}}_5$. These results suggest that $\mathrm{C}{\mathrm{e}}_3\mathrm{MgB}{\mathrm{i}}_5$ is a promising platform to explore the exotic quantum ground state.

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• Crystal growth
• Magnetic order
• Heavy-fermion systems
• Strongly correlated systems