SURFACE PHONONS IN THE ORDEREDc(2 × 2) PHASE OFPdONAu(100)

R. Chadli (), A. Khater and R. Tigrine
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R. Chadli: Laboratoire de Physique et Chimie Quantique, Université Mouloud Mammeri, B. P. 17, Tizi-Ouzou 15000, Algérie
A. Khater: Laboratoire de Physique de l'Etat Condensé, Université du Maine, Av. Olivier Messiaen, Cedex 09, Le Mans 72085, France
R. Tigrine: Laboratoire de Physique et Chimie Quantique, Université Mouloud Mammeri, B. P. 17, Tizi-Ouzou 15000, Algérie

Surface Review and Letters (SRL), 2013, vol. 20, issue 02, 1-8

Abstract: The vibrational properties of theAu(100)-c(2 × 2)-Pdordered phase, which is a stable system in the temperature range of 500 K to 600 K, are presented. This surface alloy is formed by depositingPdatoms onto theAu(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 surfaceAu(100). Three of them are observed above the bulk bands spectrum.

Keywords: Surface vibrational dynamics; ordered surface alloy; LDOS (search for similar items in EconPapers)
Date: 2013
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DOI: 10.1142/S0218625X13500194

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