Spin-lattice coupling plays an important role in both formation and understanding of the magnetism in two-dimensional magnetic semiconductors (2DMS). In this paper, the steady pressure effects on the lattice structure, Raman resonances, and magnetization of a 2DMS Cr2Ge2Te6 have been studied by both experiments and first principles calculations. It is found that the bond length of Cr-Cr decreases, the angle of Cr-Te-Cr diverges from 90°, and the Raman modes Eg3 and Ag1 show an increase with the application of external pressure. Consequently, the magnetic phase transition temperature TC decreases from 66.6 K to 60.6 K (∼9%) as the pressure increases from 0 to 1 GPa. These pressure effects not only confirm the existence of strong spin-lattice coupling but also reveal the detailed information about the lattice deformation effect on the magnetic properties in such 2DMS, which would be a benefit for the further understanding and manipulation of the magnetism in 2D materials.

中文翻译：

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流体静压力对二维铁磁Cr2Ge2Te6自旋晶格耦合的影响

自旋晶格耦合在二维磁性半导体 (2DMS) 中磁性的形成和理解中起着重要作用。在本文中，通过实验和第一性原理计算研究了稳态压力对 2DMS Cr2Ge2Te6 的晶格结构、拉曼共振和磁化的影响。发现Cr-Cr的键长减小，Cr-Te-Cr的角度从90°发散，拉曼模式Eg3和Ag1随着外压的施加而增加。因此，随着压力从 0 GPa 增加到 1 GPa，磁相变温度 TC 从 66.6 K 降低到 60.6 K（~9%）。