Unveiling the Exotic Magnetic Structure of Isotope-160Gd-enriched Kagome Metal

Kagome-lattice materials, composed of two-dimensional networks of corner-sharing triangles, have emerged as fertile platforms for exploring correlated and topological quantum phenomena. The interplay of charge density waves, magnetism, nematic order, and superconductivity provides unique opportunities to realize novel emergent states. Recently, GdTi3Bi4 has attracted particular attention for its exotic phenomena, including strong magnetic anisotropy, a one-third magnetization plateau, chirality-reversible stripe domain walls, bifurcated magnetic anisotropy with bi-oriented AFM order, and an unconventional charge spin intertwined density wave. Elucidating the origin of such unconventional density waves and their connection to anomalous transport is of fundamental importance. Our recent ARPES measurements reveal pronounced band folding, indicative of strong coupling between magnetism and electronic structure. Furthermore, transport experiments demonstrate that magnetic states can be tuned by direct current, leading to a previously unreported zero-resistance state, independently confirmed by repeated measurements. These results raise a key question of how the underlying magnetic textures and chirality evolve with temperature, magnetic field, and applied current. To address this, we propose neutron scattering studies on isotope-enriched single crystals, 160GdTi3Bi4, to directly resolve the magnetic structure.

笼目晶格材料（Kagome-lattice materials）由共角三角形构成的二维网络组成，现已成为探索关联与拓扑量子现象的优质研究平台。电荷密度波、磁性、向列序与超导电性之间的相互作用，为实现新奇演生态提供了独特机遇。近年来，GdTi3Bi4因其诸多奇异现象受到广泛关注，这些现象包括强磁各向异性、1/3磁化平台、手性可逆的条状畴壁、伴随双取向反铁磁（AFM）序的分叉磁各向异性，以及非常规的电荷-自旋交织密度波。阐明这类非常规密度波的起源及其与反常输运的关联，具有重要的基础研究价值。我们近期的角分辨光电子能谱（ARPES）测量结果显示出显著的能带折叠现象，表明磁性与电子结构之间存在强耦合作用。此外，输运实验表明，直流电流可调控磁性态，进而产生此前未见报道的零电阻态，该结果已通过重复实验独立验证。这些结果引出了一个关键问题：体系的本征磁结构与手性如何随温度、磁场与外加电流发生演化。为解决这一问题，我们提议对同位素富集的160GdTi3Bi4单晶开展中子散射研究，以直接解析其磁结构。