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:
影响因子:
--
通讯作者:
Zhang Qing-Ming
中科院分区:
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
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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