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Rare-earth engineering is an effective way to introduce and tune themagnetism in topological Kagome magnets, which has been acting as a fertileplatform to investigate the quantum interactions between geometry, topology,spin, and correlation. Here we report the structure and properties of threenewly discovered Titanium-based Kagome metals RETi3Bi4 (RE = Yb, Pr, and Nd)with various magnetic states. They crystalize in the orthogonal space groupFmmm (No.69), where slightly distorted Ti Kagome lattice, RE triangularlattice, Bi honeycomb and triangular lattices stack along the a axis. Bychanging the rare earth atoms on RE zag-zig chains, the magnetism can be tunedfrom nonmagnetic YbTi3Bi4 to short-range ordered PrTi3Bi4 (Tanomaly ~ 8.2 K),and finally to ferromagnetic NdTi3Bi4 (Tc ~ 8.5 K). The measurements ofresistivity and specific heat capacity demonstrate an evolution of electroncorrelation and density of states near the Fermi level with different rareearth atoms. In-situ resistance measurements of NdTi3Bi4 under high pressurefurther reveal a potential relationship between the electron correlation andferromagnetic ordering temperature. These results highlight RETi3Bi4 as anotherfamily of topological Kagome magnets to explore nontrivial band topology andexotic phases in Kagome materials.

Tunable magnetism and electron correlation in Titanium-based Kagome metals RETi3Bi4 (RE = Yb, Pr, and Nd) by rare-earth engineering