Evidence for Long-Range Spin Order Instead of a Peierls Transition in Si(553)-Au Chains

被引：63

作者：

Aulbach, J. ^{[1
,2
]}

Schaefer, J. ^{[1
,2
]}

Erwin, S. C. ^{[3
]}

Meyer, S. ^{[1
,2
]}

Loho, C. ^{[1
,2
]}

Settelein, J. ^{[1
,2
]}

Claessen, R. ^{[1
,2
]}

机构：

[1] Univ Wurzburg, Inst Phys, D-97074 Wurzburg, Germany

[2] Univ Wurzburg, Rontgen Ctr Complex Mat Syst RCCM, D-97074 Wurzburg, Germany

[3] Naval Res Lab, Ctr Computat Mat Sci, Washington, DC 20375 USA

来源：

PHYSICAL REVIEW LETTERS | 2013年 / 111卷 / 13期

关键词：

SURFACE;

D O I：

10.1103/PhysRevLett.111.137203

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Stabilization of the Si(553) surface by Au adsorption results in two different atomically defined chain types, one of Au atoms and one of Si. At low temperature these chains develop two-and threefold periodicity, respectively, previously attributed to Peierls instabilities. Here we report evidence from scanning tunneling microscopy that rules out this interpretation. The X3 superstructure of the Si chains vanishes for low tunneling bias, i.e., close the Fermi level. In addition, the Au chains remain metallic despite their period doubling. Both observations are inconsistent with a Peierls mechanism. On the contrary, our results are in excellent, detailed agreement with the Si(553)-Au ground state predicted by density-functional theory, where the X2 periodicity of the Au chain is an inherent structural feature and every third Si atom is spin polarized.

引用

页数：5

共 21 条

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