We report the results of the investigation of the acoustic and optical phonons in quasi-two-dimensional antiferromagnetic semiconductors of the transition metal phosphorus trisulfide family with Mn, Fe, Co, Ni, and Cd as metal atoms. The Brillouin–Mandelstam and Raman light scattering spectroscopies were conducted at room temperature to measure the acoustic and optical phonon frequencies close to the Brillouin zone center and the Γ−A high symmetry direction. The absorption and index of refraction were measured in the visible and infrared ranges using the reflectometry technique. We found an intriguing large variation, over ∼28%, in the acoustic phonon group velocities in this group of materials with similar crystal structures. Our data indicate that the full-width-at-half-maximum of the acoustic phonon peaks is strongly affected by the optical properties and the electronic bandgap. The acoustic phonon lifetime extracted for some of the materials was correlated with their thermal properties. The results are important for understanding the layered van der Waals semiconductors and assessing their potential for optoelectronic and spintronic device applications.

中文翻译：

---

准二维 MPS3 反铁磁半导体中的声学和光学声子

我们报告了以 Mn、Fe、Co、Ni 和 Cd 作为金属原子的过渡金属三硫化磷族准二维反铁磁半导体中的声学和光学声子的研究结果。布里渊-曼德尔斯坦和拉曼光散射光谱在室温下进行，测量靠近布里渊区中心和 Г−A 高对称方向的声学和光学声子频率。使用反射技术在可见光和红外范围内测量吸收率和折射率。我们发现在这组具有相似晶体结构的材料中，声子群速度存在令人感兴趣的巨大变化，超过~28%。我们的数据表明，声声子峰的半峰全宽受到光学特性和电子带隙的强烈影响。某些材料提取的声子寿命与其热性能相关。这些结果对于理解层状范德华半导体并评估其在光电和自旋电子器件应用中的潜力非常重要。