论文标题
二维Van-Waals Ferromagnet Cri $ _3 $中的单轴压力效应
Uniaxial pressure effects in the two-dimensional van-der-Waals ferromagnet CrI$_3$
论文作者
论文摘要
通过高分辨率扩散测定法对磁磁有序温度温度的磁弹性耦合和单轴压力依赖性进行了实验研究和量化。在$ t _ {\ rm c} $处清除热膨胀系数的异常，暗示$ \ partial t _ {\ rm c}/\ partial p _ {\ rm rm i} $（沿$ c $ c $ axis）施加压力。实验结果得到了数值研究的支持，表明沿着$ C $方向压缩时，主要的，内部内磁耦合会增加，并以负面积为负应变减少。相反，在应用面外和面内压缩时，层间交换最初会增加并随后减少。
Magnetoelastic coupling and uniaxial pressure dependencies of the ferromagnetic ordering temperature in the quasi-two-dimensional layered van-der-Waals material CrI$_3$ are experimentally studied and quantified by high-resolution dilatometry. Clear anomalies in the thermal expansion coefficients at $T_{\rm C}$ imply positive (negative) pressure dependencies $\partial T_{\rm C}/\partial p_{\rm i}$ for pressure applied along (perpendicular to) the $c$ axis. The experimental results are backed up by numerical studies showing that the dominant, intra-layer magnetic coupling increases upon compression along the $c$ direction and decreases with negative in-plane strain. In contrast, inter-layer exchange is shown to initially increase and subsequently decrease upon the application of both out-of-plane and in-plane compression.
