Layer dependence of stacking order in nonencapsulated few-layer CrI3
Layer dependence of stacking order in nonencapsulated few-layer CrI3
复制标题
非封装少层 CrI3 中堆叠顺序的层依赖性
DOI：
10.1007/s40843-019-1214-y
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发表时间：
2019-11-14
影响因子：
8.1
通讯作者：
Peng, Bo
中科院分区：
文献类型：
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作者：
Guo, Kai;Deng, Bowen;Peng, Bo
原子薄铁磁CrI 3中的长程磁序引发了新的迷人的物理和应用前景。二维CrI 3铁磁性材料的物理性质受层间距和层排列顺序的影响较大，而层间距和层排列顺序对静水压力和外界环境的影响较为敏感。然而，在低温下的堆积顺序仍然存在争议。在这里，我们研究了层间耦合和堆叠顺序的非封装2-5层和散装的CrI 3在10 K的拉曼光谱，证明了菱面体堆叠在反铁磁性和铁磁性CrI 3。声子对称性引起的Ag和Eg模式的相反螺旋度依赖性进一步验证了菱面体堆叠。在60 K以下观察到由于自旋-声子耦合引起的反常温度依赖行为。我们的研究提供了深入了解层间耦合和二维铁磁材料的堆叠顺序。
Long-range magnetic orders in atomically thin ferromagnetic CrI3 trigger new fascinating physics and application perspectives. The physical properties of two-dimensional (2D) ferromagnetism CrI3 are significantly influenced by interlayer spacing and stacking order, which are sensitive to the hydrostatic pressure and external environments. However, there remains debate on the stacking order at low temperature. Here, we study the interlayer coupling and stacking order of non-encapsulated 2–5 layer and bulk CrI3 at 10 K by Raman spectroscopy; demonstrate a rhombohedral stacking in both antiferromagnetic and ferromagnetic CrI3. The opposite helicity dependence of Ag and Eg modes arising from phonon symmetry further validates the rhombohedral stacking. An anomalous temperature-dependent behavior is observed due to spin-phonon coupling below 60 K. Our study provides insights into the interlayer coupling and stacking orders of 2D ferromagnetic materials.