Surface structure and phase transition of Ge(111)-3x3-Pb studied by reflection high-energy positron diffraction

被引：3

作者：

Fukaya, Y. ^{[1
]}

Hashimoto, M.

Kawasuso, A.

Ichimiya, A. ^{[2
]}

机构：

[1] Japan Atom Energy Agcy, Adv Sci Res Ctr, Res Grp Positron Beam Mat Sci, Gunma 3701292, Japan

[2] Japan Womens Univ, Fac Sci, Bunkyo Ku, Tokyo 1128681, Japan

来源：

APPLIED SURFACE SCIENCE | 2008年 / 254卷 / 23期

关键词：

phase transition; surface structure; reflection high-energy positron diffraction (RHEPD); total reflection; germanium; lead;

D O I：

10.1016/j.apsusc.2008.02.093

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 studied the structures and the phase transition of Pb/Ge(1 1 1) surface by using the reflection high-energy positron diffraction. The surface structures at 60 K and 293 K have the 3 x 3 and root 3 x root 3 periodicities, respectively. The rocking curves measured at both temperatures are nearly the same. This indicates that the equilibrium positions of the surface atoms do not change according to the phase transition. From the analysis of the rocking curve based on the dynamical diffraction theory, we found that at both temperatures the surface structures are composed of the so-called one-up and two-down model. The 3 x 3-root 3 x root 3 phase transition for the Pb/Ge(1 1 1) surface is interpreted in terms of order disorder transition. (C) 2008 Published by Elsevier B.V.

引用

页码：7827 / 7830

页数：4

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