Growth and structure of ultrathin Cr films on Pt(111)

被引：27

作者：

Zhang, LP ^{[1
]}

Kuhn, M ^{[1
]}

Diebold, U ^{[1
]}

机构：

[1] TULANE UNIV,DEPT PHYS,NEW ORLEANS,LA 70118

来源：

SURFACE SCIENCE | 1997年 / 371卷 / 2-3期

关键词：

chromium; growth; low energy electron diffraction (LEED); low energy ion scattering (LEIS); platinum; scanning tunneling microscopy; single crystal epitaxy;

D O I：

10.1016/S0039-6028(96)01001-1

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The growth and structure of ultrathin chromium films on Pt(111) have been studied using low-energy He+ ion scattering spectroscopy, X-ray photoelectron spectroscopy, low energy electron diffraction and scanning tunneling microscopy. Upon initial deposition at room temperature, the Cr atoms migrate along the Pt terraces and populate the step edges. Further growth results in two-dimensional islands of chromium developing from the step edges and across the Pt terraces. The him is pseudomorphic to the Pt(111) substrate. At coverages above 3 ML, chromium forms three-dimensional elongated islands oriented along the three close-packed directions of the Pt(111) surface. The chromium overlayer adopts a bcc (110) surface structure with the close-packed overlayer directions, [111], aligned with the close-packed Pt(111) directions, [110]. The presence of the Cr overlayer was found to electronically perturb the Pt surface atoms leading to a redistribution of charge between Pt and Cr.

引用

页码：223 / 234

页数：12

共 31 条

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