Details
| Original language | English |
|---|---|
| Pages (from-to) | 133-140 |
| Number of pages | 8 |
| Journal | Vacuum |
| Volume | 74 |
| Issue number | 2 |
| Publication status | Published - 20 Feb 2004 |
| Event | International Workshop on Surface Physics - Polanica Zdroj, Poland Duration: 13 Sept 2003 → 15 Sept 2003 |
Abstract
Coupling over large distances up to nine lattice constants of (n × 1) chain structures, formed by alkali and alkaline earth metals on anisotropic surfaces like Mo(1 1 2), occurs mainly by adsorbate-induced Friedel oscillations of the electron system at the surface. We briefly review evidence for this mechanism. It causes wave-like modulations in the adsorbate-induced lateral relaxations in the systems Li/Mo(1 1 2) and Sr/Mo(1 1 2), found by LEED-IV analysis. Within this coupling mechanism the depinning transitions of the low coverage p(8 × 1) and p(5 × 1) chain structures of the Sr/Mo(1 1 2) system can be described semi-quantitatively. The collective nature of coupling is demonstrated by adding small amounts of electronegative impurities (oxygen atoms) at concentrations far below one atom per unit cell. These impurities are able to change periodicities and symmetries as well as stabilities of structures, and partly suppress phase transitions. The complexity of these phenomena goes beyond descriptions by the simple one-dimensional coupling mechanism.
Keywords
- Impurities, Low-energy electron diffraction, Phase transitions, Two-dimensional systems
ASJC Scopus subject areas
- Physics and Astronomy(all)
- Instrumentation
- Physics and Astronomy(all)
- Condensed Matter Physics
- Materials Science(all)
- Surfaces, Coatings and Films
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In: Vacuum, Vol. 74, No. 2, 20.02.2004, p. 133-140.
Research output: Contribution to journal › Conference article › Research › peer review
}
TY - JOUR
T1 - Long-range coupling of adsorbates and its modifications on anisotropic metal surfaces
AU - Pfnür, Herbert
AU - Godzik, G.
AU - Block, Thomas
PY - 2004/2/20
Y1 - 2004/2/20
N2 - Coupling over large distances up to nine lattice constants of (n × 1) chain structures, formed by alkali and alkaline earth metals on anisotropic surfaces like Mo(1 1 2), occurs mainly by adsorbate-induced Friedel oscillations of the electron system at the surface. We briefly review evidence for this mechanism. It causes wave-like modulations in the adsorbate-induced lateral relaxations in the systems Li/Mo(1 1 2) and Sr/Mo(1 1 2), found by LEED-IV analysis. Within this coupling mechanism the depinning transitions of the low coverage p(8 × 1) and p(5 × 1) chain structures of the Sr/Mo(1 1 2) system can be described semi-quantitatively. The collective nature of coupling is demonstrated by adding small amounts of electronegative impurities (oxygen atoms) at concentrations far below one atom per unit cell. These impurities are able to change periodicities and symmetries as well as stabilities of structures, and partly suppress phase transitions. The complexity of these phenomena goes beyond descriptions by the simple one-dimensional coupling mechanism.
AB - Coupling over large distances up to nine lattice constants of (n × 1) chain structures, formed by alkali and alkaline earth metals on anisotropic surfaces like Mo(1 1 2), occurs mainly by adsorbate-induced Friedel oscillations of the electron system at the surface. We briefly review evidence for this mechanism. It causes wave-like modulations in the adsorbate-induced lateral relaxations in the systems Li/Mo(1 1 2) and Sr/Mo(1 1 2), found by LEED-IV analysis. Within this coupling mechanism the depinning transitions of the low coverage p(8 × 1) and p(5 × 1) chain structures of the Sr/Mo(1 1 2) system can be described semi-quantitatively. The collective nature of coupling is demonstrated by adding small amounts of electronegative impurities (oxygen atoms) at concentrations far below one atom per unit cell. These impurities are able to change periodicities and symmetries as well as stabilities of structures, and partly suppress phase transitions. The complexity of these phenomena goes beyond descriptions by the simple one-dimensional coupling mechanism.
KW - Impurities
KW - Low-energy electron diffraction
KW - Phase transitions
KW - Two-dimensional systems
UR - http://www.scopus.com/inward/record.url?scp=2342630028&partnerID=8YFLogxK
U2 - 10.1016/j.vacuum.2003.12.110
DO - 10.1016/j.vacuum.2003.12.110
M3 - Conference article
AN - SCOPUS:2342630028
VL - 74
SP - 133
EP - 140
JO - Vacuum
JF - Vacuum
SN - 0042-207X
IS - 2
T2 - International Workshop on Surface Physics
Y2 - 13 September 2003 through 15 September 2003
ER -