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          Institute: Fritz-Haber-Institut     Collection: Molecular Physics     Display Documents

ID: 41850.0, Fritz-Haber-Institut / Molecular Physics
α-Ga(010) surface reconstruction:   A LEED structural analysis of the (1x1) room temperature and (2√2x√2)R45° low-temperature structures
Authors:Moré, Sam; Soares, E. A.; Van Hove, Michel A.; Lizzit, S.; Baraldi, A.; Grütter, Ch.; Bilgram, J. H.; Hofmann, Philip
Date of Publication (YYYY-MM-DD):2003-08-22
Title of Journal:Physical Review B
Journal Abbrev.:Phys. Rev. B
Issue / Number:7
Start Page:075414-1
End Page:075414-10
Copyright:2003 The American Physical Society
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:The geometric structure of the -Ga(010)-(1x1) room temperature structure and its (2rootx2root2)R45° reconstruction below 232 K have been determined using low-energy electron diffraction structure analysis. The room temperature structure conforms to the cut-dimer model, forming a two-dimensional metallic structure with only minimal lateral displacements of the atoms. The topmost interlayer distance is 1.53 Å, corresponding to a spacing expansion of 2% from the bulk. In the low-temperature structure, the surface atoms shift to dimerize within the top two layers, resulting in a network of mostly covalent bonds, which form both parallel and perpendicular to the surface plane. The bond lengths of some of these dimers are about 10% shorter than the bond length found in the -Ga bulk and are thus shorter than any GaGa bonds reported so far.
External Publication Status:published
Document Type:Article
Communicated by:Gerard Meijer
Affiliations:Fritz-Haber-Institut/Molecular Physics
External Affiliations:Institute for Molecular Science, Myodaiji, Okazaki, Aichi Japan; Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California, USA; Departamento de Física, ICEx, UFMG, 30123-970, Belo Horizonte,Brazil; Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California, USA; Department of Physics, University of California-Davis, Davis, California, USA; Sincrotrone Trieste, S.S. 14 Km. 163.5, Trieste, Italy; Dipartimento di Fisica, Universitá di Trieste, Trieste, Italy; Laboratorio TASC-INFM, S.S. 14 Km. 163.5, 34012 Trieste, Italy; Laboratorium für Festkörperphysik, Eidgenössische Technische Hochschule, Zürich, Switzerland; Institute for Storage Ring facilities, University of Aarhus, Aarhus C, Denmark
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