Surface structures and thermal vibrations of Ni and Cu thin films studied by extended x-ray-absorption fine structure

Manabu Kiguchi, Toshihiko Yokoyama, Daiju Matsumura, Hiroshi Kondoh, Osamu Endo, Toshiaki Ohta

研究成果: Article査読

27 被引用数 (Scopus)

抄録

Temperature- and angle-dependent extended x-ray-absorption fine-structure spectra of Cu and Ni thin films grown epitaxially on highly oriented pyrolytic graphite were measured and analyzed in order to investigate the dynamical properties of the surface metal-metal bonds. From the mean-square relative displacements of the metal-metal bonds, the effective Debye temperatures of the surface in-plane and out-of-plane bonds were determined. The surface bonds were found to be much softer and anharmonic, especially for the surface normal direction, than those of the corresponding bulk metals. We have also carried out classical Monte Carlo simulations for Cu films based on the embedded-atom method. The experimental results were reproduced qualitatively well and it was clarified that the out-of-plane bonds between the first and the second layer are noticeably weaker than the other bonds such as the in-plane bond in the first layer.

本文言語English
ページ(範囲)14020-14027
ページ数8
ジャーナルPhysical Review B - Condensed Matter and Materials Physics
61
20
DOI
出版ステータスPublished - 2000 1 1
外部発表はい

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 凝縮系物理学

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