Vasilieva E V, Petrov O F, Vasiliev M M
Joint Institute for High Temperatures, Russian Academy of Sciences, Moscow, Russia.
Moscow Institute of Physics and Technology, Dolgoprudny, Russia.
Sci Rep. 2021 Jan 12;11(1):523. doi: 10.1038/s41598-020-80082-x.
We present a detailed analysis of experimental study, which shows clear evidence of a two-stage melting process of a quasi-two-dimensional dusty plasma system in a high-frequency gas discharge. We accurately calculated global parameters of the orientational and translational order, as well as their susceptibilities to determine two critical points, related to "solid-to-hexatic" and "hexatic-to-liquid" phase transitions. The nature of the emerging defects and changes in their mutual concentration, in addition to the estimate of core energy of free dislocations also counts in favor of the formation of an intermediate hexatic phase. These results are fully consistent with the Berezinsky-Kosterlitz-Thouless theory.
我们对一项实验研究进行了详细分析，该研究显示了高频气体放电中准二维尘埃等离子体系统两阶段熔化过程的明确证据。我们精确计算了取向和移动有序的全局参数，以及它们的磁化率，以确定与“固-六方相”和“六方相-液相”相变相关的两个临界点。除了对自由位错核心能量的估计外，新出现缺陷的性质及其相互浓度的变化也有利于中间六方相的形成。这些结果与贝雷津斯基-科斯特利茨- Thouless理论完全一致。
