论文标题
$^4 $ HE量子水晶的动力学
Dynamics of a $^4$He quantum crystal in the superfluid liquid
论文作者
论文摘要
当晶体落入超流体液体中，由于重力在粗糙的过渡过渡上方，整个晶体表面处于原子质粗糙状态时，氦晶体的运动已经进行了实验研究。 t = 1.25 K时晶体降低速率高于t = 1.54 k的晶体率。这证明了超氟氦正常成分在晶体运动减速中的重要作用。容器中的压力测量表明表面动力学对晶体运动及其尺寸的影响。在T = 1.54 K时低表面迁移率的晶体的跌落不会显着改变压力。 T = 1.25 K时的高表面迁移率会在晶体掉落过程中降低容器的压力。压降超过了晶体的初始位置和最终位置之间的静水压力差。停止后，容器中的压力放松到上面提到的差异。这个事实表明，超流体液体流动中晶体的额外生长。
The motion of helium crystals has been experimentally studied when the crystals fall in the superfluid liquid owing to gravity at temperatures above the roughening transitions where the whole crystal surface is in the atomically rough state. The rate of crystal fall at T = 1.25 K is higher than at T = 1.54 K. This is proof of the essential role of the normal component of superfluid helium in the deceleration of crystal motion. The pressure measurements in the container have shown the effect of surface kinetics on the motions of the crystal and its size. The fall of crystals with the low surface mobility at T = 1.54 K does not change the pressure significantly. The high surface mobility at T = 1.25 K results in decreasing the pressure in the container in the course of the fall of a crystal. The pressure drop exceeds the difference in the hydrostatic pressure between the initial and final positions of the crystal. After the stop, the pressure in the container relaxes to the difference mentioned above. This fact demonstrates an additional growth of the crystal in the flow of a superfluid liquid.
