Local and long-range order of carbon impurities on Fe(100): Analysis of self-organization at a nanometer scale
Articolo
Data di Pubblicazione:
2006
Citazione:
Local and long-range order of carbon impurities on Fe(100): Analysis of self-organization at a nanometer scale / G. Panaccione, J. Fujii, I. Vobornik, G. Trimarchi, N. Binggeli, A. Goldoni, R. Larciprete, G. Rossi. - In: PHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS. - ISSN 1098-0121. - 73:3(2006), pp. 035431.1-035431.9.
Abstract:
Bulk carbon impurities segregate at the Fe(100) surface and, upon thermal annealing, can form metastable surface phases, with local and long-range order, that show peculiar electronic properties. We present a surface science study of C-segregated Fe(100) with scanning tunneling microscopy/spectroscopy (STM/STS), core level spectroscopy, and ab initio calculations of the surface structure. In particular, we investigate a c (32Ã2) structure, observed for 0.67±0.05 atomic layers of C segregated at the iron surface. This structure is found to be due to self-organized carbon stripes, which form a regular pattern on a nanometer lateral scale and are made of zig-zag chains. The C atoms in the chains lie slightly off center in the fourfold hollow site and are bonded to 5 Fe neighbors. Striking features of this structure are the self-avoiding chains, the passivation effect of the iron surface, and the presence of one-dimensional-like Fe surface states close to the Fermi energy.
Tipologia IRIS:
01 - Articolo su periodico
Keywords:
Generalized gradient approximation; scanning tunneling spectroscopy; equilibrium surface segregation; phonon dispersions; metal-surface; states; MO(100); sulfur; microscopy; FE(001)
Elenco autori:
G. Panaccione, J. Fujii, I. Vobornik, G. Trimarchi, N. Binggeli, A. Goldoni, R. Larciprete, G. Rossi
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