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ELECTRONIC AND ATOMIC STRUCTURE OF$(\sqrt{5}\times\sqrt{5}){\rm R}27^{\circ}-{\rm Yb}/{\rm Al}(001)$

Author

Listed:
  • R. FASEL

    (Institut de Physique, Université de Fribourg, Pérolles, CH-1700 Fribourg, Switzerland)

  • P. AEBI

    (Institut de Physique, Université de Fribourg, Pérolles, CH-1700 Fribourg, Switzerland)

  • L. SCHLAPBACH

    (Institut de Physique, Université de Fribourg, Pérolles, CH-1700 Fribourg, Switzerland)

  • T. GREBER

    (Physik-Institut, Universität Zürich-Irchel, CH-8057 Zürich, Switzerland)

  • J. OSTERWALDER

    (Physik-Institut, Universität Zürich-Irchel, CH-8057 Zürich, Switzerland)

Abstract

A particularly interesting phenomenon of rare-earth metals and their compounds is the mixed valence, which is intimately connected with the structural properties of a material. We report structural and spectroscopic results from the$(\sqrt{5}\times \sqrt{5}){\rm R}27^{\circ}-{\rm Yb}/{\rm Al}(001)$interface, with particular emphasis on the interplay between surface structure and valence. A strong reconstruction of the substrate surface is observed, with the Yb atoms occupying substitutional sites. A small fraction of Yb atoms is identified to occupy second-layer sites in otherwise unreconstructed surface patches. It is shown that these subsurface Yb atoms are in a mixed-valent4f14-δstate, whereas the surface atoms in the$(\sqrt{5}\times\sqrt{5}){\rm R}27^{\circ}$geometry persist in the divalent4f14state.

Suggested Citation

  • R. Fasel & P. Aebi & L. Schlapbach & T. Greber & J. Osterwalder, 1997. "ELECTRONIC AND ATOMIC STRUCTURE OF$(\sqrt{5}\times\sqrt{5}){\rm R}27^{\circ}-{\rm Yb}/{\rm Al}(001)$," Surface Review and Letters (SRL), World Scientific Publishing Co. Pte. Ltd., vol. 4(06), pages 1155-1160.
    • Handle: RePEc:wsi:srlxxx:v:04:y:1997:i:06:n:s0218625x97001462
    DOI: 10.1142/S0218625X97001462
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