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Sm- and Yb-induced reconstructions of the Si(111) surface

Wigren, C.; Andersen, J. N. LU ; Nyholm, R. LU ; Göthelid, M.; Hammar, M.; Törnevik, C. and Karlsson, U. O. (1993) In Physical Review B (Condensed Matter) 48(15). p.11014-11019
Abstract

Low-energy electron diffraction, scanning tunneling microscopy, and photoelectron spectroscopy results from the submonolayer Sm- and Yb-induced surface structures are presented. Several similar metal-induced surface reconstructions are found to exist for Yb and Sm on Si(111) for low submonolayer coverages: 3×2, 5×1, and 7×1. At higher submonolayer coverage, Yb induces a 2×1 reconstruction while Sm induces a (3 × 3) R30°-like reconstruction. Yb is found to be divalent in all structures, whereas the Sm valence increases with increasing coverage. In the 3×2 structure only divalent Sm is present, in the 5×1 and 7×1 structures a small amount of trivalent Sm appears, and, finally, in the (3 × 3) R30°structure approximately half of the Sm... (More)

Low-energy electron diffraction, scanning tunneling microscopy, and photoelectron spectroscopy results from the submonolayer Sm- and Yb-induced surface structures are presented. Several similar metal-induced surface reconstructions are found to exist for Yb and Sm on Si(111) for low submonolayer coverages: 3×2, 5×1, and 7×1. At higher submonolayer coverage, Yb induces a 2×1 reconstruction while Sm induces a (3 × 3) R30°-like reconstruction. Yb is found to be divalent in all structures, whereas the Sm valence increases with increasing coverage. In the 3×2 structure only divalent Sm is present, in the 5×1 and 7×1 structures a small amount of trivalent Sm appears, and, finally, in the (3 × 3) R30°structure approximately half of the Sm atoms are trivalent. The surface Fermi-level position in the band gap for the different Sm and Yb reconstructions has been measured. The difference in valence stability between Sm and Yb is suggested to be the cause of the difference in the high-coverage structures found and the differences in pinning level for the two elements observed for the 5×1 and 7×1 structures. © 1993 The American Physical Society.

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author
organization
publishing date
type
Contribution to journal
publication status
published
in
Physical Review B (Condensed Matter)
volume
48
issue
15
pages
6 pages
publisher
American Physical Society
external identifiers
  • Scopus:0000210235
ISSN
0163-1829
DOI
10.1103/PhysRevB.48.11014
language
English
LU publication?
yes
id
965c41e8-9eab-4b4d-8476-c84f98a132d6
date added to LUP
2016-04-29 11:19:26
date last changed
2016-05-21 12:01:30
@misc{965c41e8-9eab-4b4d-8476-c84f98a132d6,
  abstract     = {<p>Low-energy electron diffraction, scanning tunneling microscopy, and photoelectron spectroscopy results from the submonolayer Sm- and Yb-induced surface structures are presented. Several similar metal-induced surface reconstructions are found to exist for Yb and Sm on Si(111) for low submonolayer coverages: 3×2, 5×1, and 7×1. At higher submonolayer coverage, Yb induces a 2×1 reconstruction while Sm induces a (3 × 3) R30°-like reconstruction. Yb is found to be divalent in all structures, whereas the Sm valence increases with increasing coverage. In the 3×2 structure only divalent Sm is present, in the 5×1 and 7×1 structures a small amount of trivalent Sm appears, and, finally, in the (3 × 3) R30°structure approximately half of the Sm atoms are trivalent. The surface Fermi-level position in the band gap for the different Sm and Yb reconstructions has been measured. The difference in valence stability between Sm and Yb is suggested to be the cause of the difference in the high-coverage structures found and the differences in pinning level for the two elements observed for the 5×1 and 7×1 structures. © 1993 The American Physical Society.</p>},
  author       = {Wigren, C. and Andersen, J. N. and Nyholm, R. and Göthelid, M. and Hammar, M. and Törnevik, C. and Karlsson, U. O.},
  issn         = {0163-1829},
  language     = {eng},
  number       = {15},
  pages        = {11014--11019},
  publisher    = {ARRAY(0x7865b18)},
  series       = {Physical Review B (Condensed Matter)},
  title        = {Sm- and Yb-induced reconstructions of the Si(111) surface},
  url          = {http://dx.doi.org/10.1103/PhysRevB.48.11014},
  volume       = {48},
  year         = {1993},
}