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

R. Chadli, A. Khater, R. Tigrine

Research output: Contribution to journalArticle

3 Citations (Scopus)

### 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 language English 1350019 Surface Review and Letters 20 2 https://doi.org/10.1142/S0218625X13500194 Published - Apr 2013 Yes

### Fingerprint

Phonons
phonons
Dispersions
Green's function
Green's functions
Annealing
formalism
harmonics
Atoms
Temperature
annealing
symmetry
approximation
atoms
temperature

### Keywords

• LDOS
• ordered surface alloy
• Surface vibrational dynamics

### ASJC Scopus subject areas

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

### Cite this

Surface phonons in the ordered c(2 × 2) phase of Pd on Au(100). / Chadli, R.; Khater, A.; Tigrine, R.

In: Surface Review and Letters, Vol. 20, No. 2, 1350019, 04.2013.

Research output: Contribution to journalArticle

Chadli, R. ; Khater, A. ; Tigrine, R. / Surface phonons in the ordered c(2 × 2) phase of Pd on Au(100). In: Surface Review and Letters. 2013 ; Vol. 20, No. 2.
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