论文标题
通过在范德华磁铁中调整配体旋转轨道耦合来访问新的磁性机制
Accessing new magnetic regimes by tuning the ligand spin-orbit coupling in van der Waals magnets
论文作者
论文摘要
Van der Waals（VDW）材料在低维磁性研究中开了新的方向。在很大程度上尚未探索的竞技场是将VDW磁铁朝向新的地面的内在调整。 Trihalides Chromium提供了第一个这样的例子，并在去角质时出现了层间磁耦合。在这里，我们采用另一种方法来设计新的地下态，而不是通过去角质来调整非磁性配体原子的自旋轨道耦合（SOC）（CL，BR，I）。我们合成了一个三壁式系列，crcl $ _ {3-x-y} $ br $ _ {x} $ i $ _ {y {y} $，并将其磁性属性映射为CL，BR和I内容的函数。由此产生的三角形相图在Crcl $ _ {3} $附近揭示了一个沮丧的制度。第一原理计算证实，挫败感是由铬和卤化物Soc之间的竞争所驱动的。此外，我们揭示了大部分crcl $ _ {3-x-y} $ br $ _ {x} $ i $ _ {y} $ crystals在与剥落实验相同的字段中的现场引起的层间耦合变化。
Van der Waals (VdW) materials have opened new directions in the study of low dimensional magnetism. A largely unexplored arena is the intrinsic tuning of VdW magnets toward new ground-states. The chromium trihalides provided the first such example with a change of inter-layer magnetic coupling emerging upon exfoliation. Here, we take a different approach to engineer new ground-states, not by exfoliation, but by tuning the spin-orbit coupling (SOC) of the non-magnetic ligand atoms (Cl,Br,I). We synthesize a three-halide series, CrCl$_{3-x-y}$Br$_{x}$I$_{y}$, and map their magnetic properties as a function of Cl, Br, and I content. The resulting triangular phase diagrams unveil a frustrated regime near CrCl$_{3}$. First-principles calculations confirm that the frustration is driven by a competition between the chromium and halide SOCs. Furthermore, we reveal a field-induced change of inter-layer coupling in the bulk of CrCl$_{3-x-y}$Br$_{x}$I$_{y}$ crystals at the same field as in the exfoliation experiments.
