Institute of Physics, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Hanoi, Viet Nam.
Institute of Physics, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Hanoi, Viet Nam.
Spectrochim Acta A Mol Biomol Spectrosc. 2023 Sep 5;297:122753. doi: 10.1016/j.saa.2023.122753. Epub 2023 Apr 15.
Two-dimensional correlation spectroscopy (2D-COS) and perturbation-correlation moving window two-dimensional correlation spectroscopy (PCMW2D) analysis are performed on the temperature-dependent Raman spectra of hexagonal LuMnO single crystal. Under the resonance with the on-site Mn d-d transitions, the correlation between the phonons which are relate to the vibration of Mn ions' bonds and spin-excitation peaks suggest a strong spin-phonon coupling in LuMnO. The PCMW2D results clearly show that the significant change in phonons and spin-excitation peaks occurs around the Néel temperature and the spin reorientation transition. The multiple components in the broad spin-excitation peaks also suggest variations in spin symmetries in the ground state. Furthermore, we propose that the 2D-COS and PCMW2D Raman correlation spectroscopies provide a simple and powerful method for investigating the couplings and the transitions, which would be very important for understanding systematically the magnetoelectric properties of multiferroic materials.
对六方 LuMnO 单晶的温度依赖拉曼光谱进行二维相关光谱（2D-COS）和微扰相关移动窗口二维相关光谱（PCMW2D）分析。在与局域 Mn d-d 跃迁共振的情况下，与 Mn 离子键振动有关的声子之间的相关性和自旋激发峰表明 LuMnO 中存在强自旋-声子耦合。PCMW2D 的结果清楚地表明，在奈尔温度和自旋重定向转变附近，声子和自旋激发峰发生了显著变化。在宽自旋激发峰中的多个分量也表明基态中自旋对称性的变化。此外，我们提出 2D-COS 和 PCMW2D 拉曼相关光谱学为研究耦合和转变提供了一种简单而强大的方法，这对于系统地理解多铁材料的磁电性质非常重要。
