论文标题
CR2GE2TE6单轴压力和短距离相关的强大影响6
Strong effects of uniaxial pressure and short-range correlations in Cr2Ge2Te6
论文作者
论文摘要
cr $ _2 $ ge $ _2 $ te $ _6 $是准2D半导体的范德华·瓦尔斯·费罗马格（Van der Waals Ferromagnet），降低到双层，具有巨大的技术应用潜力。以实现室温应用的临界温度是该路径上的关键下一步之一。在这里，我们报告了有关Cr $ _2 $ ge $ _2 $ _2 $ _6 $单晶的高分辨率电容扩张学研究（$ {\ partial} $ - $ 15.6 k/gpa）来自热力学关系。因此，适度的面内应变足以强烈增强Cr $ _2 $ ge $ _2 $ _2 $ te $ _6 $的强烈增强的铁磁性。此外，发现最高200〜K的短距离磁性序列的明确标志。
Cr$_2$Ge$_2$Te$_6$ is a quasi-2D semiconducting van der Waals ferromagnet down to the bilayer with great potential for technological applications. Engineering the critical temperature to achieve room temperature applications is one of the critical next steps on this path. Here, we report high-resolution capacitance dilatometry studies on Cr$_2$Ge$_2$Te$_6$ single crystals which directly prove significant magnetoelastic coupling and provide quantitative values of the large uniaxial pressure effects on long-range magnetic order (${\partial}T_{\mathrm{C}}/{\partial}p_{\mathrm{c}}$ = 24.7 K/GPa and ${\partial}T_{\mathrm{C}}/{\partial}p_{\mathrm{ab}}$ = $-$15.6 K/GPa) derived from thermodynamic relations. Moderate in-plane strain is thus sufficient to strongly enhance ferromagnetism in Cr$_2$Ge$_2$Te$_6$ up to room temperature. Moreover, unambiguous signs for short-range magnetic order up to 200~K are found.
