Calculation of the vibration properties of the Pd/Au (111) ordered surface alloy in its stable domain

R. Chadli, A. Khater, R. Tigrine

    Research output: Contribution to journalConference article

    Abstract

    In the present paper, a calculation is presented for the vibration properties of the ordered surface alloy alloy Au(111) -(√3×√3) R30° - Pd , which is a stable system in the temperature range of 500K to 600K. This surface alloy is formed by depositing Pd atoms onto the Au(111)surface, and annealing at higher temperatures. The matching theory is applied to calculate the surface phonons and local vibration densities of states (LDOS) for the clean Au (111) surface, and for the Au(111) - (√3×√3)R30° - Pd surface alloy. Our theoretical results for the surface phonon branches of the clean Au (111) surface compare favorably with previous ab initio results and experimental data. In contrast, there are no previous results for the vibrational LDOS for the atomic Au site in a clean Au (111) surface, or results for the surface phonons and vibration spectra for the surface alloy. The surface phonons are calculated for the clean Au (111) surface and the ordered surface alloy along three directions of high symmetry, namely ΓM ,MK,and KΓ . The phonon branches are strongly modified from the Au (111) surface to the surface alloy. In particular a remarkable change takes place for the LDOS between the clean Au (111) surface and the surface alloy, which may find its origin in the charge transfer from Au atoms to Pd atoms.

    Original languageEnglish
    Article number00012
    JournalEPJ Web of Conferences
    Volume29
    DOIs
    Publication statusPublished - 1 Dec 2012
    Event1st Euro-Mediterranean Meeting on Functionalized Materials, EMM-FM 2011 - Sousse, Tunisia
    Duration: 6 Sep 201110 Sep 2011

      Fingerprint

    ASJC Scopus subject areas

    • Physics and Astronomy(all)

    Cite this