放射光励起高分解能角度分解光電子分光による金属表面上の1次元電子状態の研究 One-Dimensional Electronic States of Metal Surfaces Studied by High-Resolution Angle-Resolved Ultraviolet Photoelectron Spectroscopy using Synchrotron Radiation

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Surface electronic states of a stepped Cu(755) surface were studied by angle-resolved ultraviolet photoelectron spectroscopy using synchrotron radiation (SR-ARUPS). We have observed an isotropic free-electron-like surface state below the Fermi level. Unlike to the stepped Ni(755) surface with the same surface structure, no electronic state localized at the step edges was found. This experimental fact shows that the valence-band structure plays an important role in inducing step-localized states. In addition, we tried to prepare Co atomic chains on the stepped Cu(755) surface by vacuum deposition. However, the analysis of low-electron-energy-diffraction (LEED) patterns shows that the Co atoms grow in island-growth mode into epitaxial triangular nanoislands. The Co electronic structure in these Co nanoislands is investigated also by SR-ARUPS. Below 0.2 ML, two Co-derived zero-dimensional peaks were clearly resolved at around 0.3 and 1.1 eV. With coverage increasing, these peaks shift toward each other. This peak shift dependent on the Co coverage is explained in terms of the enhanced exchange splitting that is caused to reduce unavoidably increased Coulomb interaction between Co electrons with flat-band localized in thesmall Co nanoislands at low coverages.

収録刊行物

  • 表面科学 = Journal of The Surface Science Society of Japan

    表面科学 = Journal of The Surface Science Society of Japan 25(8), 478-484, 2004-08-10

    公益社団法人 日本表面科学会

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各種コード

  • NII論文ID(NAID)
    10013444763
  • NII書誌ID(NCID)
    AN00334149
  • 本文言語コード
    JPN
  • 資料種別
    ART
  • ISSN
    03885321
  • NDL 記事登録ID
    7063045
  • NDL 雑誌分類
    ZM35(科学技術--物理学)
  • NDL 請求記号
    Z15-379
  • データ提供元
    CJP書誌  NDL  J-STAGE 
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