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

Abstract

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

arXiv commentManuscript:17 pages, 5 figures; Supporting information:11 pages, 11 tables and 10 figures

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• Spin density wave and van Hove singularity in the kagome metal CeTi3Bi4
• Diverse electronic landscape of the kagome metal YbTi3Bi4
• Kagome metals
• Magnetic-coupled electronic landscape in bilayer-distorted titanium-based kagome metals
• Intricate magnetic landscape in antiferromagnetic kagome metal TbTi${}_3$Bi${}_4$ and interplay with Ln${}_{2-x}$Ti${}_{6+x}$Bi${}_9$ (Ln: Tb-Lu) shurikagome metals
• Spectroscopic origin of giant anomalous Hall effect in an interwoven magnetic kagome metal
• Lattice dynamics study of electron-correlation-induced charge density wave in antiferromagnetic kagome metal FeGe
• Observation of multiple flat bands and van Hove singularities in the distorted kagome metal NdTi3Bi4
• Breathing-Driven Metal-Insulator Transition in Correlated Kagome Systems
• Observation of unexpected band splitting and magnetically-induced band structure reconstruction in TbTi${}_3$Bi${}_4$
• Isolated spin ladders in Ln${}_2$Ti${}_9$Sb${}_{11}$ (Ln:La-Nd) metals
• Synergistic doping and stabilization of magnetically tunable LnTi${}_3$(Sb,Sn)${}_4$ (Ln:Ce--Gd) kagome metals
• Precompression engineering of metal-insulator transition and magnetism in designed breathing kagome systems
• Revealing magnetism in the distorted kagome $R$Ti${}_3$Bi${}_4$ ($R$ = Nd, Sm, Gd) via ARPES and XMCD