Epitaxial growth of ultrathin palladium films on Re{0001}
Epitaxial growth of ultrathin palladium films on Re{0001}
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Re 上超薄钯膜的外延生长{0001}
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发表时间：
2011
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通讯作者：
R. Bennett
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文献类型：
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作者：
H. Etman;Z. Zheleva;G. Held;R. Bennett
超薄双金属层通过低维、多态性、减少屏蔽和外延应变带来的电子结构的改变，产生不寻常的磁性和表面化学效应。先前的研究通过 Hammer 和 Norskov 的 d 带模型将价态和核能级的变化与表面反应性联系起来，并且在异质外延薄膜中，该能带位置是由配位、应变以及基底和覆盖层状态的杂化的竞争效应决定的。在本研究中，我们采用 Re{0001} 系统上的外延匹配 Pd 来生长无横向应变的薄膜。我们利用低能电子衍射的最新进展来充分扩展数据范围，以便可靠地确定生长顺序和面外表面弛豫作为薄膜厚度的函数。该结果得到了扫描隧道显微镜和 X 射线光电子能谱的支持，表明生长是逐层进行的，由于......
Ultrathin bimetallic layers create unusual magnetic and surface chemical effects through the modification of electronic structure brought on by low dimensionality, polymorphism, reduced screening, and epitaxial strain. Previous studies have related valence and core-level shifts to surface reactivity through the d-band model of Hammer and Norskov, and in heteroepitaxial films this band position is determined by competing effects of coordination, strain, and hybridization of substrate and overlayer states. In this study we employ the epitaxially matched Pd on Re{0001} system to grow films with no lateral strain. We use a recent advancement in low-energy electron diffraction to expand the data range sufficiently for a reliable determination of the growth sequence and out-of-plane surface relaxation as a function of film thickness. The results are supported by scanning tunneling microscopy and X-ray photoemission spectroscopy, which show that the growth is layer-by-layer with significant core-level shifts due...