Adsorbate-induced Surface Stiffening: Surface Lattice Dynamics of Ru(001)-(1x1)-O

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

Adsorbate-induced Surface Stiffening: Surface Lattice Dynamics of Ru(001)-(1x1)-O

Materials Science 2007-05-23 v1

Authors: T. Moritz , W. Widdra , D. Menzel , K. -P. Bohnen , R. Heid

Abstract

The dynamical properties of the high-density Ru(001)-(1 $\times$ 1)-O phase has been investigated by a combined high-resolution electron energy loss spectroscopy and density functional theory study. Due to a strong static outward relaxation of the first Ru layer a soft Rayleigh phonon mode is expected. However, a Rayleigh mode stiffening together with a new high energy in-plane phonon mode above the bulk bands is found which is related to a strong adsorbate-induced intralayer force constant stiffening which counteracts an interlayer softening. This structurally rather simple system with one surface atom per (1 $\times$ 1) unit cell demonstrates the limited applicability of previously adopted models.

Keywords

surface phonon electron energy loss spectroscopy density functional theory Ru(001) adsorbate-induced stiffening

Cite

@article{arxiv.cond-mat/0211704,
  title  = {Adsorbate-induced Surface Stiffening: Surface Lattice Dynamics of Ru(001)-(1x1)-O},
  author = {T. Moritz and W. Widdra and D. Menzel and K. -P. Bohnen and R. Heid},
  journal= {arXiv preprint arXiv:cond-mat/0211704},
  year   = {2007}
}

Comments

3 figures; submitted to Phys.Rev

Adsorbate-induced Surface Stiffening: Surface Lattice Dynamics of Ru(001)-(1x1)-O

Abstract

Keywords

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