Collapsing of thermally induced steps on the Pb(111) surface.
Collapsing of thermally induced steps on the Pb(111) surface.
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Pb(111) 表面上热致台阶的塌陷。
DOI：
10.1103/physrevlett.62.2148
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发表时间：
1989
影响因子：
8.6
通讯作者：
Wang
中科院分区：
文献类型：
--
作者：
Yang;Lǔ;Wang
利用高分辨低能电子衍射技术，我们观察到在550 K附近台阶Pb（111）表面台阶密度的增加。在室温下，Pb（111）表面含有台阶，平均台阶宽度为63埃。在580 K时，在表面达到其最大粗糙度后，台阶突然塌陷，表面看起来非常平坦。观察到的现象的一个可能的解释是表面熔化相变的发生，这是由热激发的高密度的步骤。
Using high-resolution low-energy electron diffraction techniques we have observed an increase in step density near 550 K in a stepped Pb (111) surface. At room temperature the Pb (111) surface contained steps with an average terrace width of 63 Å. At 580 K, after the surface reached its maximum roughness, the steps suddenly collapsed and the surface appeared to be extremely flat. A possible explanation of the observed phenomenon is the occurrence of a surface melting phase transition which is induced by the thermally excited high density of steps.