SURFACE EFFECTS IN RARE-EARTH MATERIALS

C. Laubschat and E. Weschke
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C. Laubschat: Institut für Oberflächen-und Mikrostrukturphysik, Technische Universität Dresden, D-01062 Dresden, Germany
E. Weschke: Institut Für Experimentalphysik, Freie Universität Berlin, Arnimallee 14, D-14195 Berlin, Germany

Surface Review and Letters (SRL), 1996, vol. 03, issue 05n06, 1773-1778

Abstract: Recent experimental results concerning the surface-related electronic structure of rare-earth (RE) compounds are presented. Special attention is paid to the occurrence of surface-valence transitions for trivalent and mixed-valent compounds of Sm, Eu, Tm and Yb which are due to an energetical lowering of unoccupied 4f states caused by the reduced atomic coordination at the surface. Similar phenomena are observed for so-called α-like Ce compounds which are characterized by a strong hybridization of the 4f levels with valence-band states. Here, the reduced atomic coordination causes mainly a decrease in hybridization leading to an enhanced localization of the 4f states in the outermost atomic surface layer. The importance of this phenomenon for the correct interpretation of electron-spectroscopic data of Ce systems is discussed.

Date: 1996
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DOI: 10.1142/S0218625X96002709

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