Raman scattering study of two-dimensional magnetic van der Waals compound VI3

Raman scattering study of two-dimensional magnetic van der Waals compound VI3
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二维磁性范德华化合物VI3的拉曼散射研究

DOI:
10.1088/1674-1056/ab8215
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发表时间:
2020-05
期刊:
Chin. Phys. B
影响因子:
--
通讯作者:
Zhang Qing-Ming
Zhang Qing-Ming
中科院分区:
其他
文献类型:
--
作者:
Wang Yi-Meng;Tian Shang-Jie;Li Cheng-He;Jin Feng;Ji Jian-Ting;Lei Hechang;Zhang Qing-Ming

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层状磁性货车德瓦耳斯材料由于其潜在的应用和重要的基础研究而引起了人们极大的兴趣。先前对磁性货车德瓦耳斯化合物VI 3的X射线衍射(XRD)研究揭示了高于磁性转变的结构转变,但输出关于对称性的有争议的分析。在本文中,我们进行了偏振拉曼散射测量VI 3从10 K到300 K,重点是两个A g声子模式在1271.1 cm-1和128.4 cm-1。我们仔细的对称性分析的基础上的角度相关的光谱表明,晶体的对称性可以很好地描述为C2 h,而不是D3 d以上的结构相变和以下。我们进一步进行了温度依赖的拉曼实验,以研究在VI 3的磁性。Fano不对称性和两个A g声子模在低温下的反常线宽下降,指向一个显着的自旋-声子耦合。这也得到了磁性跃迁上方71.1-cm− 1模软化的支持。这项研究提供了晶格动力学的基本信息,并澄清了VI 3中的对称性。研究结果表明,自旋-声子耦合在较宽的温度范围内存在,具有一定的应用价值。
The layered magnetic van der Waals materials have generated tremendous interest due to their potential applications and importance in fundamental research. Previous x-ray diffraction (XRD) studies on the magnetic van der Waals compound VI 3, revealed a structural transition above the magnetic transition but output controversial analysis on symmetry. In this paper we carried out polarized Raman scattering measurements on VI 3 from 10 K to 300 K, with focus on the two A g phonon modes at∼ 71.1 cm− 1 and 128.4 cm− 1. Our careful symmetry analysis based on the angle-dependent spectra demonstrates that the crystal symmetry can be well described by C 2h rather than D 3d both above and below structural phase transition. We further performed temperature-dependent Raman experiments to study the magnetism in VI 3. Fano asymmetry and anomalous linewidth drop of two A g phonon modes at low temperatures, point to a significant spin–phonon coupling. This is also supported by the softening of 71.1-cm− 1 mode above the magnetic transition. The study provides the fundamental information on lattice dynamics and clarifies the symmetry in VI 3. And spin–phonon coupling existing in a wide temperature range revealed here may be meaningful in applications.
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