Accessing new magnetic regimes by tuning the ligand spin-orbit coupling in van der Waals magnets
Accessing new magnetic regimes by tuning the ligand spin-orbit coupling in van der Waals magnets
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DOI：
10.1126/sciadv.abb9379
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发表时间：
2020-07
期刊：
影响因子：
13.6
通讯作者：
T. Tartaglia;Joseph N. Tang;J. Lado;F. Bahrami;M. Abramchuk;G. McCandless;Meaghan C. Doyle;K. Burch;Ying Ran;J. Chan;F. Tafti
中科院分区：
文献类型：
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作者：
T. Tartaglia;Joseph N. Tang;J. Lado;F. Bahrami;M. Abramchuk;G. McCandless;Meaghan C. Doyle;K. Burch;Ying Ran;J. Chan;F. Tafti
通过调节两种类型的自旋轨道耦合之间的竞争，揭示了以前未知的磁制度和现象。货车范德华（VdW）材料为低维磁性的研究开辟了新的方向。一个很大程度上未开发的竞技场是VdW磁体朝向新基态的内在调谐。三卤化铬提供了第一个这样的例子，其在剥离时出现层间磁耦合的变化。在这里，我们采取不同的方法来设计以前未知的基态，而不是通过剥离，而是通过调整的自旋轨道耦合（SOC）的双金属配体原子（Cl，Br，I）。我们合成了一个三卤化物系列，CrCl3 − x − yBrxIy，并绘制了它们的磁性随Cl，Br和I含量的变化。由此产生的三角形相图揭示了CrCl 3附近的受挫制度。第一性原理计算证实，挫折是由铬和卤化物SOC之间的竞争。此外，我们揭示了场诱导的层间耦合的变化在大部分的CrCl 3 − x − yBrxIy晶体在相同的领域在剥离实验。
Previously unknown magnetic regimes and phenomena are revealed by tuning the competition between two types of spin-orbit coupling. 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. Chromium trihalides provided the first such example with a change of interlayer magnetic coupling emerging upon exfoliation. Here, we take a different approach to engineer previously unknown ground states, not by exfoliation, but by tuning the spin-orbit coupling (SOC) of the nonmagnetic ligand atoms (Cl, Br, I). We synthesize a three-halide series, CrCl3 − x − yBrxIy, and map their magnetic properties as a function of Cl, Br, and I content. The resulting triangular phase diagrams unveil a frustrated regime near CrCl3. 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 interlayer coupling in the bulk of CrCl3 − x − yBrxIy crystals at the same field as in the exfoliation experiments.