AI 中文总结
研究二维CrS₂中关联驱动的拓扑输运和稳健铁磁性。通过无催化剂化学气相沉积生长，结合输运测量、第一性原理计算和磁性测量等方法，揭示其电子特性和磁交换作用，确立1T-CrS₂为关联3d层状铁磁体，电子关联与自旋轨道耦合协同驱动拓扑输运。
AI 中文摘要
在量子材料中，实现具有稳健铁磁性和新兴拓扑输运的关联层状磁体仍然是一个关键挑战。本文报道通过无催化剂化学气相沉积生长出层状1T-CrS₂，形成具有面外易轴各向异性且居里温度高于室温的高度稳定范德华铁磁体。输运测量显示在80K附近有半金属-绝缘体转变，高达350K有明显负磁阻。低于30K出现拓扑霍尔效应。第一性原理计算表明自旋轨道耦合产生类狄拉克交叉，电子关联重构费米面。磁性测量揭示强近邻铁磁交换稳定长程铁磁性。结果表明1T-CrS₂是一种罕见的关联3d层状铁磁体，其中电子关联和自旋轨道耦合协同驱动新兴拓扑输运。
英文摘要
The realization of correlated layered magnets hosting robust ferromagnetism with emergent topological transport remains a key challenge in quantum materials. Here we report the first catalyst-free chemical vapour deposition growth of layered 1T-CrS$_2$, establishing a highly stable vdWs ferromagnet with an out-of-plane easy-axis anisotropy and a Curie temperature above room temperature. Transport measurements reveal a semimetal--insulator crossover near 80 K and pronounced negative magnetoresistance up to 350 K. A topological Hall effect emerges below 30 K, a rare signature of correlated transport in layered transition-metal dichalcogenide ferromagnets. First-principles calculations show that spin--orbit coupling gaps Dirac-like crossings, while electronic correlations reconstruct the Fermi surface by suppressing electron pockets and reducing the carrier density, enhancing momentum-dependent out-of-plane spin polarization. Magnetic measurements, supported by Heisenberg exchange calculations, reveal strong nearest-neighbour ferromagnetic exchange that stabilizes long-range ferromagnetism. Our results establish 1T-CrS$_2$ as a rare correlated 3$d$ layered ferromagnet in which electronic correlations and spin--orbit coupling cooperatively drive emergent topological transport.
Comments10 Pages, 4 figures and additional supplementary information
