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

Abstract

Here we present the discovery and characterization of the kagome metal TbTi${}_3$Bi${}_4$ in tandem with a new series of compounds, the Ln${}_{2-x}$Ti${}_{6+x}$Bi${}_9$ (Ln: Tb-Lu) shurikagome metals. We previously reported on the growth of the LnTi${}_3$Bi${}_4$ (Ln: La-Gd${}^{3+}$, Eu${}^{2+}$, Yb${}^{2+}$) family, a chemically diverse and exfoliable series of kagome metals with complex and highly anisotropic magnetism. However, unlike the La-Gd analogs, TbTi${}_3$Bi${}_4$ cannot be synthesized by our previous methodology due to phase competition with Ln${}_{2-x}$Ti${}_{6+x}$Bi${}_9$ (x$\sim$1.7-1.2). Here we discuss the phase competition between the LnTi${}_3$Bi${}_4$ and Ln${}_{2-x}$Ti${}_{6+x}$Bi${}_9$ families, helping to frame the difficulty in synthesizing LnTi${}_3$Bi${}_4$ compounds with small Ln species and providing a strategy to circumvent formation of Ln${}_{2-x}$Ti${}_{6+x}$Bi${}_9$. Detailed characterization of the magnetic and electronic transport properties on single crystals of TbTi${}_3$Bi${}_4$ reveals a highly complex landscape of magnetic phases arising from an antiferromagnetic ground state. A series of metamagnetic transitions creates at least 5 unique magnetic phase pockets, including a 1/3 and 2/3 magnetization plateau. Further, the system exhibits an intimate connection between the magnetism and magnetotransport, exhibiting sharp switching from positive (+40%) to negative magnetoresistance (-50%). Like the LnTi${}_3$Bi${}_4$ kagome metals, the Ln${}_{2-x}$Ti${}_{6+x}$Bi${}_9$ family exhibits quasi-2D networks of titanium and chains of rare-earth. We present the structures and some basic magnetic properties of the Ln${}_{2-x}$Ti${}_{6+x}$Bi${}_9$ family alongside our characterization of the newly discovered TbTi${}_3$Bi${}_4$.

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• Kagome metals
• Tunable bifurcation of magnetic anisotropy and bi-oriented antiferromagnetic order in kagome metal GdTi3Bi4
• Anisotropic magnetism of polymorphic ErAl3
• 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
• Revealing magnetism in the distorted kagome $R$Ti${}_3$Bi${}_4$ ($R$ = Nd, Sm, Gd) via ARPES and XMCD
• Synergistic doping and stabilization of magnetically tunable LnTi${}_3$(Sb,Sn)${}_4$ (Ln:Ce--Gd) kagome metals