Surface phase transition and electronic structure of c(5 root 2 x root 2)R45 degrees-Pb/Cu(100)

V. Joco, J Martinez-Blanco, P. Segovia, Balasubramanian Thiagarajan, J. Fujii, E. G. Michel

Research output: Chapter in Book/Report/Conference proceedingPaper in conference proceedingResearchpeer-review

7 Citations (SciVal)

Abstract

The c(5 root 2 x root 2)R45 degrees-Pb/Cu(100) surface phase is investigated by means of angle resolved ultraviolet photoemission and low energy electron diffraction in the temperature range between 300 and 550 K. We identify and characterize a temperature-induced surface phase transition at 440 K from the room temperature e(5 root 2 x root 2) R45 degrees phase to a (root 2 x root 2)R45 degrees structure with split superstructure spots. The phase transition is fully reversible and takes place before the two-dimensional melting of the structure at 520 K. The electronic structure of the split (root 2 x root 2)R45 degrees phase is characterized by a metallic free-electron like surface band. This surface band is backfolded with c(5 root 2 x root 2)R45 degrees periodicity phase at room temperature, giving rise to a surface band gap at the Fermi energy. We propose that a gain in electronic energy explains in part the stability of the c(5 root 2 x root 2)R45 degrees phase. (c) 2006 Elsevier B.V. All rights reserved.
Original languageEnglish
Title of host publicationProceedings of the 23th European Conference on Surface Science (Surface Science)
PublisherElsevier
Pages3851-3855
Volume600
DOIs
Publication statusPublished - 2006
Event23th European Conference on Surface Science - Berlin, Germany
Duration: 2005 Sep 42005 Sep 9

Publication series

Name
Number18
Volume600
ISSN (Print)0039-6028

Conference

Conference23th European Conference on Surface Science
Country/TerritoryGermany
CityBerlin
Period2005/09/042005/09/09

Subject classification (UKÄ)

  • Natural Sciences
  • Physical Sciences

Keywords

  • electronic energy
  • surface phase transition
  • Pb
  • photoemission
  • Cu(100)

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