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Sökning: WFRF:(Konvicka C)

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1.
  • Lundgren, Edvin, et al. (författare)
  • Two-dimensional oxide on Pd(111).
  • 2002
  • Ingår i: Physical Review Letters. - 1079-7114. ; 88:24, s. 246103-246103
  • Tidskriftsartikel (refereegranskat)abstract
    • The oxidation of Pd(111) leads to an incommensurate surface oxide, which was studied by the use of scanning tunneling microscopy, surface x-ray diffraction, high resolution core level spectroscopy, and density functional calculations. A combination of these methods reveals a two-dimensional structure having no resemblance to bulk oxides of Pd. Our study also demonstrates how the atomic arrangement of a nontrivial incommensurate surface can be solved by molecular dynamics in a case where experimental techniques alone give no solution.
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2.
  • Lundgren, Edvin, et al. (författare)
  • Geometry of the valence transition induced surface reconstruction of Sm(0001).
  • 2002
  • Ingår i: Physical Review Letters. - 1079-7114 .- 0031-9007. ; 88:13, s. 136102-136102
  • Tidskriftsartikel (refereegranskat)abstract
    • 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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