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摘要翻译：
我们观察到hcp$^4$He晶粒与液体$^4$He的平衡界面。我们发现，当出现在液-固界面时，晶界形成了一个二面角$2θ为非零的沟槽。这一测量结果表明，晶界并没有被液相完全润湿，这与最近的蒙特卡罗模拟结果一致。根据$θ的值，晶界与固壁的接触线可能被液体润湿。在这种情况下，直线是一个具有弯曲三角形截面的细通道，其测量宽度与简单模型的预测一致。我们在晶界预熔的背景下讨论了这些测量，并为将来理解固体$^4$He可能的超流体性提供了依据。
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英文标题：
《Wetting Properties of Grain Boundaries in Solid Helium 4》
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作者：
S. Sasaki, F. Caupin, S. Balibar
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最新提交年份：
2007
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分类信息：
一级分类：Physics 物理学
二级分类：Other Condensed Matter 其他凝聚态物质
分类描述：Work in condensed matter that does not fit into the other cond-mat classifications
在不适合其他cond-mat分类的凝聚态物质中工作
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一级分类：Physics 物理学
二级分类：Statistical Mechanics 统计力学
分类描述：Phase transitions, thermodynamics, field theory, non-equilibrium phenomena, renormalization group and scaling, integrable models, turbulence
相变，热力学，场论，非平衡现象，重整化群和标度，可积模型，湍流
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英文摘要：
We have observed boundaries between hcp $^4$He crystal grains in equilibrium with liquid $^4$He. We have found that, when emerging at the liquid-solid interface, a grain boundary makes a groove whose dihedral angle $2\theta$ is non-zero. This measurement shows that grain boundaries are not completely wet by the liquid phase, in agreement with recent Monte Carlo simulations. Depending on the value of $\theta$, the contact line of a grain boundary with a solid wall may be wet by the liquid. In this case, the line is a thin channel with a curved triangular cross section, whose measured width agrees with predictions from a simple model. We discuss these measurements in the context of grain boundary premelting and for a future understanding of the possible supersolidity of solid $^4$He.
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PDF链接：
https://arxiv.org/pdf/707.311
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