Anomalous surface lattice dynamics of a simple hexagonal close-packed surface

R. Heid; K.-P. Bohnen; T. Moritz; K. L. Kostov; D. Menzel; W. Widdra

doi:10.1103/PhysRevB.66.161406

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Anomalous surface lattice dynamics of a simple hexagonal close-packed surface

R. Heid, K.-P. Bohnen, T. Moritz, K. L. Kostov, D. Menzel, and W. Widdra

Phys. Rev. B 66, 161406(R) – Published 29 October 2002

Abstract

The surface lattice dynamics of Ru(001) has been investigated by a combined first-principles calculation and high-resolution electron-energy-loss spectroscopy. We find very anomalous dispersion curves of low-frequency surface modes and indications of strong softening of longitudinally polarized vibrations. They originate from large modifications of in-plane surface force constants unexpected for such a compact hexagonal surface.

Received 5 September 2002

DOI:https://doi.org/10.1103/PhysRevB.66.161406

Authors & Affiliations

R. Heid^1,*, K.-P. Bohnen¹, T. Moritz², K. L. Kostov^2,†, D. Menzel², and W. Widdra^2,3

¹Forschungszentrum Karlsruhe, Institut für Festkörperphysik, D-76021 Karlsruhe, Germany
²Physik-Department E20, Technische Universität München, D-85747 Garching, Germany
³Max-Born-Institut für Nichtlineare Optik und Kurzzeitspektroskopie, D-12489 Berlin, Germany

^*Corresponding author. FAX: +49-724782-4624. Email address: heid@ifp.fzk.de
^†Permanent address: Inst. of General and Inorganic Chemistry, Bulgarian Acadamy of Sciences, Sofia, Bulgaria.

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Vol. 66, Iss. 16 — 15 October 2002

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