标题： 在静水压力下的自旋-应变相互作用在$α$-RuCl$_3$ 显示英文标题

标题： Spin-strain interactions under hydrostatic pressure in $α$-RuCl$_3$

摘要： 我们研究了静水压力对$\alpha$-RuCl$_3$的影响，这是一种可能具有自旋液体基态的蜂窝晶格上 Kitaev 自旋模型的典型材料。 通过在最高 1.16 GPa 压力下的超声测量，我们揭示了该材料声学性质和$H$-$T$相图的显著变化。 静水压力抑制了三维磁序，并在较高压力下诱导出二聚化相变。 在低压力下，声衰减表现出线性温度依赖性，而在 0.28 GPa 以上，它几乎与温度无关，这表明由马约拉纳费米子主导的声子散射区域发生了转变。 这些发现为Kitaev磁体中的自旋-应变相互作用提供了新的见解，并详细表征了在静水压力下$H$-$T$ 的$\alpha$-RuCl$_3$相图。 显示英文摘要

摘要： We investigate the effects of hydrostatic pressure on $\alpha$-RuCl$_3$, a prototypical material for the Kitaev spin model on a honeycomb lattice with a possible spin-liquid ground state. Using ultrasound measurements at pressures up to 1.16 GPa, we reveal significant modifications of the acoustic properties and the $H$-$T$ phase diagram of this material. Hydrostatic pressure suppresses the three-dimensional magnetic order and induces a dimerization transition at higher pressures. At low pressures, the sound attenuation exhibits a linear temperature dependence, while above 0.28 GPa, it becomes nearly temperature independent, suggesting a shift in the phonon scattering regime dominated by Majorana fermions. These findings provide new insights into spin-strain interactions in Kitaev magnets and deliver a detailed characterization of the $H$-$T$ phase diagram of $\alpha$-RuCl$_3$ under hydrostatic pressure.