Abstract
Magnetic kagome materials provide a platform for exploring magneto-transport phenomena, symmetry breaking and charge ordering driven by the intricate interplay among electronic structure, topology and magnetism. Yet geometric frustration in conventional kagome magnets limits their tunability. Here we propose a design strategy for interweaving quasi-one-dimensional magnetic Tb zigzag chains with non-magnetic Ti-based kagome bilayers in TbTi3Bi4. Comprehensive spectroscopic analyses reveal coexisting elliptical-spiral magnetic and spin-density-wave orders accompanied by a large ~90 meV band-folding gap. The combined magnetic and electronic state leads to a giant anomalous Hall conductivity of 105 Ω−1 cm−1, which exceeds that observed in frustrated kagome analogues. These results establish TbTi3Bi4 as a model system of magnetic kagome metals with strong electron–magnetism interactions and underscore the necessity of interweaving designed magnetic and charge layers separately to achieve tunable transport properties. This design strategy will enable the discovery of emergent quantum states and next-generation electronic materials.
| Original language | English |
|---|---|
| Journal | Nature Materials |
| DOIs | |
| State | Accepted/In press - 2025 |
Funding
This work was financially supported by the Deutsche Forschungsgemeinschaft (DFG) under SFB1143 (project no. 247310070), the Würzburg-Dresden Cluster of Excellence on Complexity and Topology in Quantum Matter—ct.qmat (EXC 2147, project no. 390858490) and grant no. QUASTFOR5249-449872909 from the research unit QUAntitative Spatio-Temporal model-building for correlated electronic matter (QUAST). E.C. acknowledges financial support from the Alexander von Humboldt Foundation. Z.L. acknowledges support from the National Natural Science Foundation of China (92365204 and 12274298) and National Key R&D Program of China (grant no. 2022YFA1604400/03). The SP-STM measurements (W.C. and W.W.) at Rutgers were supported by the Office of Basic Energy Sciences, Division of Materials Sciences and Engineering, US Department of Energy (DOE), under award no. DE-SC0018153. Y.-f.Y. acknowledges support from the National Natural Science Foundation of China (12174429) and National Key R&D Program of China (grant no. 2022YFA1402203). A portion of this research used resources from the High-Flux Isotope Reactor, a DOE Office of Science user facility operated by Oak Ridge National Laboratory. The beam time was allocated to HB-3A DEMAND with proposal no. IPTS-33129. E.C. expresses gratitude to Y. Xu, Y. Pan, C. Yi and D. C. Peets for their insightful discussions and to D. Chen for assistance with the thermal-expansion measurements.