固体氦的低温弹性反常
The low temperature elastic anomalies in solid helium
摘要：
六方晶系$^4$ He样品的弹性性质显示出各种异常。当温度低于$\sim$ 0.2 K时，弹性剪切模量变硬，转动惯量下降。这两个量之间的关系进行了研究的经典变形体力学的框架内。本文对极软二维位错层的塑性流动形成模型进行了解析和数值研究。这个模型定量地解释了一些实验。其他情况下，它可能似乎不太相关，讨论。
英文摘要：
The elastic properties of hcp $^4$He samples have been shown to display various anomalies. The elastic shear modulus stiffens and the moment of rotational inertia drops when the temperature is lowered below $\sim$ 0.2 K. The relation between these two quantities is studied within the framework of classical deformable-body mechanics. A model based on the formation by plastic flow of extremely soft two-dimensional layers of dislocations is studied analytically and numerically. This model accounts quantitatively for a number of experiments. Other situations, in which it may seem less relevant, are discussed.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
