Scanning tunneling microscopy study on a BC3 covered NbB2(0001) surface

被引：30
作者：
Ueno, A.
Fujita, T.
Matsue, M.
Yanagisawa, H.
Oshima, C.
Patthey, F.
Ploigt, H. -C.
Schneider, W. -D.
Otani, S.
机构：
[1] Waseda Univ, Dept Appl Phys, Shinjuku Ku, Tokyo 1698555, Japan
[2] Ecole Polytech Fed Lausanne, Inst Phys Nanostruct, CH-1015 Lausanne, Switzerland
[3] Natl Inst Mat Sci, Tsukuba, Ibaraki 3050044, Japan
来源：
SURFACE SCIENCE | 2006年 / 600卷 / 17期
关键词：
scanning tunneling microscopy; scanning tunneling spectroscopy; low energy electron diffraction; BC3; honeycomb structure; surface structure; surface segregation; thin film structure;
D O I：
10.1016/j.susc.2006.07.007
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：
We have investigated a BC3 covered NbB2(0 0 0 1) Surface using scanning tunneling microscopy (STM), scanning tunneling spectroscopy (STS), and low energy electron diffraction (LEED). The STM images reveal characteristic features of a Moire pattern reflecting an incommensurate relation of the BC3 sheet with the substrate: bright protrusions with the periodicity of the substrate lattice are modulated in intensity with the periodicity of the BC3 lattice. As a result, the surface exhibits nm-scale patchy regions with either the root 3 x root 3 or the I x I structure of the substrate. The two-dimensional Fourier transformation pattern of the STM image is consistent with the LEED pattern proving the epitaxial and incommensurate relationship between BC3 surface sheet and substrate. No feature of a predicted superconducting gap was found in STS spectra measured at 5 K. (c) 2006 Elsevier B.V. All rights reserved.
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页码：3518 / 3521
页数：4
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