Shan Min, Li Shunjiao, Yang Ye, Zhao Dan, Li Jian, Nie Linpeng, Wu Zhimian, Zhou Yanbing, Zheng Lixuan, Kang Baolei, Wu Tao, Chen Xianhui
Hefei National Research Center for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, Anhui, 230026, China.
CAS Key Laboratory of Strongly-coupled Quantum Matter Physics, Department of Physics, University of Science and Technology of China, Hefei, Anhui, 230026, China.
Adv Sci (Weinh). 2024 Oct;11(40):e2403824. doi: 10.1002/advs.202403824. Epub 2024 Aug 29.
Spin-orbit coupling (SOC) has significant effects on the superconductivity and magnetism of transition metal dichalcogenides (TMDs) at the 2D limit. Although 2D TMD samples possess many exotic properties different from those of bulk samples, experimental characterization in this field is still limited, especially for magnetism. Recent studies have revealed that bulk misfit layer compounds (MLCs) with (LaSe)(NbSe) exhibit an Ising superconductivity similar to that of heavily electron-doped NbSe monolayers. This offers an opportunity to study the effect of SOC on the magnetism of 2D TMDs. Here, the possible SOC effect in (LaSe)(NbSe) is investigated by measuring nuclear magnetic resonance (NMR) and electrical transport. It is found that the LaSe layer not only functions as a charge reservoir for transferring electrons into the NbSe layer but also remarkably influences the local electronic environment around the Nb nuclei. More importantly, the significant SOC induces both a weak antilocalization (WAL) effect and anisotropic spin fluctuations in noncentrosymmetric NbSe layers. The present work contributes to a deep understanding of the role of the SOC effect in 2D TMDs and supports MCLs as an intriguing platform for exploring exotic physical properties within the 2D limit.
在二维极限下，自旋轨道耦合（SOC）对过渡金属二硫属化物（TMDs）的超导性和磁性有显著影响。尽管二维TMD样品具有许多与块状样品不同的奇异特性，但该领域的实验表征仍然有限，尤其是在磁性方面。最近的研究表明，具有（LaSe）（NbSe）的块状错配层化合物（MLCs）表现出与重电子掺杂的NbSe单层类似的伊辛超导性。这为研究SOC对二维TMDs磁性的影响提供了一个机会。在此，通过测量核磁共振（NMR）和电输运，研究了（LaSe）（NbSe）中可能的SOC效应。发现LaSe层不仅作为电荷库将电子转移到NbSe层，而且显著影响Nb原子核周围的局部电子环境。更重要的是，显著的SOC在非中心对称的NbSe层中诱导了弱反局域化（WAL）效应和各向异性自旋涨落。本工作有助于深入理解SOC效应在二维TMDs中的作用，并支持MLCs作为在二维极限内探索奇异物理性质的一个有趣平台。
