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Träfflista för sökning "WFRF:(Torrelles J. M.) srt2:(2002-2004)"

Sökning: WFRF:(Torrelles J. M.) > (2002-2004)

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1.
  • 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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2.
  • Gustafson, Johan, et al. (författare)
  • Self-limited growth of a thin oxide layer on Rh(111)
  • 2004
  • Ingår i: Physical Review Letters. - 1079-7114. ; 92:12
  • Tidskriftsartikel (refereegranskat)abstract
    • The oxidation of the Rh(111) surface at oxygen pressures from 10(-10) mbar to 0.5 bar and temperatures between 300 and 900 K has been studied on the atomic scale using a multimethod approach of experimental and theoretical techniques. Oxidation starts at the steps, resulting in a trilayer O-Rh-O surface oxide which, although not thermodynamically stable, prevents further oxidation at intermediate pressures. A thick corundum like Rh2O3 bulk oxide is formed only at significantly higher pressures and temperatures.
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