Uniaxial and biaxial strain approaches are usually implemented to switch the ferroelastic states, which play a key role in the application of the ferroics and shape memory materials. In this work, by using the first-principles calculations, we found not only uniaxial strain, but also shear strain can induce a novel ferroelastic switching, in which the van der Waals (vdW) layered direction rotates with the ferroelastic transition in layered bulk PdSe₂. This is an interesting phenomenon that has never been discovered. The novel three-state ferroelastic switching in layered PdSe₂ also occurs under shear strain. Our result shows that the shear strain could be used as an effective approach for manipulating the functionalities of layered materials in potential device applications.

通常采用单轴和双轴应变方法来切换铁弹性状态，这在铁磁和形状记忆材料的应用中起着关键作用。在这项工作中，通过使用第一性原理计算，我们不仅发现了单轴应变，而且剪切应变还可以诱发一种新型的铁弹性转换，其中范德华（vdW）的分层方向随着层状大体积PdSe中的铁弹性转变而旋转。₂。这是一个从未发现的有趣现象。层状PdSe _2中的新型三态铁弹性转换也发生在剪切应变下。我们的结果表明，剪切应变可以用作在潜在设备应用中操纵层状材料功能的有效方法。