Surface phonons in the ordered c(2 × 2) phase of Pd on Au(100)

R. Chadli, A. Khater, R. Tigrine

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Abstract

The vibrational properties of the Au(100)-c(2 × 2)-Pd ordered phase, which is a stable system in the temperature range of 500 K to 600 K, are presented. This surface alloy is formed by depositing Pd atoms onto the Au(100) surface, and annealing at higher temperatures. The equilibrium structural characteristics, phonon dispersions as well as the local density of phonon states are calculated using the matching theory associated with Green's function formalism evaluated in the harmonic approximation. New surface modes have been found on the ordered metallic surface alloy along the three directions of high symmetry $\overline{\Gamma X}$, $\overline{XM}$, and $\overline{M\Gamma}$, in comparison with the clean surface Au(100). Three of them are observed above the bulk bands spectrum.

Original languageEnglish
Article number1350019
JournalSurface Review and Letters
Volume20
Issue number2
DOIs
Publication statusPublished - Apr 2013
Externally publishedYes

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Keywords

  • LDOS
  • ordered surface alloy
  • Surface vibrational dynamics

ASJC Scopus subject areas

  • Surfaces and Interfaces
  • Condensed Matter Physics
  • Materials Chemistry
  • Surfaces, Coatings and Films

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