来自错切表面的晶体截断棒
Crystal truncation rods from miscut surfaces
摘要：
晶体截断棒用于研究表面和界面结构。由于实际的表面总是从低折射率平面有一定程度的错切，因此研究错切对晶体截断棒的影响是很重要的。我们开发了一个模型，描述了截断棒散射的斜切表面，有步骤和梯田。我们发现，不均匀的梯田宽度和锯齿状的步骤边缘都是粗糙度的形式，降低强度的杆。不均匀的平台宽度也会导致与棒重叠的宽峰。我们使用我们的模型来表征三个SrTiO $_3$（001）样品的台阶宽度分布和台阶边缘锯齿，显示出良好的协议之间的模型和数据，证实了原子力显微镜的表面形貌。我们期望我们对阶地粗糙度的描述将适用于许多表面，即使是那些没有明显阶地的表面。
英文摘要：
Crystal truncation rods are used to study surface and interface structure. Since real surfaces are always somewhat miscut from a low index plane, it is important to study the effect of miscut on crystal truncation rods. We develop a model that describes the truncation rod scattering from miscut surfaces that have steps and terraces. We show that non-uniform terrace widths and jagged step edges are both forms of roughness that decrease the intensity of the rods. Non-uniform terrace widths also result in a broad peak that overlaps the rods. We use our model to characterize the terrace width distribution and step edge jaggedness on three SrTiO$_3$ (001) samples, showing excellent agreement between the model and the data, confirmed by atomic force micrographs of the surface morphology. We expect our description of terrace roughness will apply to many surfaces, even those without obvious terracing.
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