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

R. Fasel (), P. Aebi, L. Schlapbach, T. Greber and J. Osterwalder
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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

Surface Review and Letters (SRL), 1997, vol. 04, issue 06, 1155-1160

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.

Date: 1997
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DOI: 10.1142/S0218625X97001462

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