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Electron properties and surface effects of rare-earth systems

Identifieur interne : 002B12 ( Main/Curation ); précédent : 002B11; suivant : 002B13

Electron properties and surface effects of rare-earth systems

Auteurs : C. Laubschat [Allemagne]

Source :

RBID : Pascal:98-0046699

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English descriptors

Abstract

Recent experimental results concerning the surface-related electronic structure of rare-earth solids are presented. Special attention is paid to the occurrence of surface-valence transitions in trivalent or mixed-valent compounds of Sm, Eu, Tm, and Yb that are due to energetically lowering of unoccupied 4f-states caused by the reduced atomic coordination at the surface. Similar phenomena are encountered in Ce-systems leading to a decrease of 4f-hybridization in the outermost atomic surface layer. The importance of this phenomenon for the correct interpretation of electron-spectroscopic data of Ce-systems is discussed. Experimental evidence for transitions from a localized to an itinerant behavior of the 4f-states is obtained for CeRh3.

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Pascal:98-0046699

Le document en format XML

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<country>Allemagne</country>
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<term>Core levels</term>
<term>Electron delocalization</term>
<term>Electronic structure</term>
<term>Experimental study</term>
<term>Fano effect</term>
<term>Hybridization</term>
<term>Inverse photoemission</term>
<term>Itinerant model</term>
<term>Mixed-valence compounds</term>
<term>Multiplet state</term>
<term>Photoelectron spectroscopy</term>
<term>Surface electron state</term>
<term>Terbium</term>
<term>Thin films</term>
<term>Thulium</term>
<term>Valence</term>
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<term>Etat électronique surface</term>
<term>Structure électronique</term>
<term>Hybridation</term>
<term>Valence</term>
<term>Composé valence mixte</term>
<term>Modèle itinérant</term>
<term>Spectrométrie photoélectron</term>
<term>Photoémission inverse</term>
<term>Niveau coeur</term>
<term>Etat multiplet</term>
<term>Effet Fano</term>
<term>Délocalisation électronique</term>
<term>Couche mince</term>
<term>Terbium</term>
<term>Thulium</term>
<term>Etude expérimentale</term>
<term>7320A</term>
<term>7960D</term>
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<term>Valence (Drôme)</term>
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<div type="abstract" xml:lang="en">Recent experimental results concerning the surface-related electronic structure of rare-earth solids are presented. Special attention is paid to the occurrence of surface-valence transitions in trivalent or mixed-valent compounds of Sm, Eu, Tm, and Yb that are due to energetically lowering of unoccupied 4f-states caused by the reduced atomic coordination at the surface. Similar phenomena are encountered in Ce-systems leading to a decrease of 4f-hybridization in the outermost atomic surface layer. The importance of this phenomenon for the correct interpretation of electron-spectroscopic data of Ce-systems is discussed. Experimental evidence for transitions from a localized to an itinerant behavior of the 4f-states is obtained for CeRh
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