Geometry of the Valence Transition Induced Surface Reconstruction of Sm(0001) | Zendy

Edvin Lundgren | Zendy; J. N. Andersen | Zendy; R. Nyholm | Zendy; X. Torrelles | Zendy; Jordi Rius | Zendy; Anna Delin | Zendy; Alexei Grechnev | Zendy; Olle Eriksson | Zendy; C. Konvicka | Zendy; Michael Schmid | Zendy; П. Варга | Zendy

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Geometry of the Valence Transition Induced Surface Reconstruction of Sm(0001)

Author(s) -

Edvin Lundgren,

J. N. Andersen,

R. Nyholm,

X. Torrelles,

Jordi Rius,

Anna Delin,

Alexei Grechnev,

Olle Eriksson,

C. Konvicka,

Michael Schmid,

П. Варга

Publication year - 2002

Publication title -

physical review letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 3.688

H-Index - 673

eISSN - 1079-7114

pISSN - 0031-9007

DOI - 10.1103/physrevlett.88.136102

Subject(s) - valence (chemistry) , surface reconstruction , materials science , condensed matter physics , physics , atomic physics , surface (topology) , geometry , quantum mechanics , mathematics

We present a structural determination of the surface reconstruction of the Sm(0001) surface using surface x-ray diffraction, scanning tunneling microscopy, and ab initio calculations. The reconstruction is associated with a large (22%) expansion of the atomic radius for the top monolayer surface Sm atoms. The mechanism driving the surface reconstruction in Sm is unique among all elements and is connected to the strong correlations of the 4f electrons in Sm and the intermediate valence observed in certain Sm compounds. The atoms constituting the top monolayer of Sm(0001) have vastly different chemical properties compared to the layer underneath and behave as if they were an adsorbate of a different chemical species

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