结晶甲烷在温度区间$60-70~K$的异常行为。从实验到理论
Abnormal behavior of crystalline methane in temperature interval $60-70~K$. From experiment to theory
摘要：
本文分析了在平衡蒸气压下，固体甲烷在$0.5T_{tr} -T_{tr}$（$T_{tr}$为三相点温度）温度区间内的力学、结构、热物理和光谱性质。结果表明，在文献正文中观察到了60- 70 ~K温度范围内所研究的性质的异常现象。提出了“topons”（固体甲烷中转动自由度的集体激发）的概念。所有观察到的异常现象都可以在这个概念的框架内得到解释。关键词：固态甲烷，量子晶体，转动自由度，晶体的热物理和力学性质
英文摘要：
The paper presents an analysis of mechanical, structural, thermophysical and spectral properties of solid methane in temperature interval $0.5T_{tr} -T_{tr}$ ($T_{tr}$ is the triple point temperature) under equilibrium vapor pressure. It is shown that the anomalies of the studied properties at temperatures 60--70~K have been observed in the body of the reviewed papers. A concept of "topons" (collective excitations of rotational degrees of freedom in solid methane) is proposed. A whole of the observed anomalies can be explained in the frames of this concept. Key words: solid methane, quantum crystals, rotational degrees of freedom, thermophysical and mechanical properties of the crystals
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