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arXiv 1201.0735cond-mat.mtrl-sci
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Ge(111)2x 1表面Co沉积后Co/Ge混合层的形成

Formation of Co/Ge intermixing layers after Co deposition on Ge(111)2x1 surfaces

D. A. Muzychenko, K. Schouteden, V. I. Panov, C. Van Haesendonck

摘要:

用扫描隧道显微镜(STM)研究了低温下Co沉积在Ge(111)2x 1表面上形成的一种新的表面重构。沉积的Co原子在4.5K的衬底温度下是不动的,而它们可以在80 K或更高的温度下沿着上部π键合链扩散。这种迁移率导致Co原子在原子台阶处、在畴界处以及在原子平坦的Ge台阶上积累,例如,空位或吸附原子,其中形成重构的Co/Ge混合层。电压依赖的STM图像显示,新重建的表面局部表现出高度有序的原子结构,具有与初始2 × 1重建相同的周期性。此外,它显示出沿[2-1-1]方向的双周期性,这可能与π键链的电子性质的修改有关。

英文摘要:

The formation of a novel surface reconstruction upon Co deposition on freshly cleaved Ge(111)2x1 surfaces is studied by means of scanning tunneling microscopy (STM) at low temperature. The deposited Co atoms are immobile at substrate temperatures of 4.5K, while they can diffuse along the upper pi-bonded chains at a temperature of 80K and higher. This mobility results in accumulation of Co atoms at atomic steps, at domain boundaries as well as on atomically flat Ge terraces at, e.g., vacancies or adatoms, where reconstructed Co/Ge intermixing layers are formed. Voltage dependent STM images reveal that the newly reconstructed surface locally exhibits a highly ordered atomic structure, having the same periodicity as that of the initial 2x1 reconstruction. In addition, it shows a double periodicity along the [2-1-1] direction, which can be related to the modified electronic properties of the pi-bonded chains.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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