Details
| Originalsprache | Englisch |
|---|---|
| Seiten (von - bis) | 124-134 |
| Seitenumfang | 11 |
| Fachzeitschrift | Surface Science |
| Jahrgang | 481 |
| Ausgabenummer | 1-3 |
| Publikationsstatus | Veröffentlicht - 8 Juni 2001 |
Abstract
We study the collective diffusion in chain structures on anisotropic substrates like (1 1 2) bcc and (1 1 0) fcc surfaces with deep troughs in the substrate potential corrugation. These chain structures are aligned normal to the troughs and can move only along the troughs. In a combination of theoretical arguments and of numerical simulations, we study the mass transport in these anisotropic systems. We find that a mechanism similar to soliton diffusion, instead of single particle diffusion, is still effective at temperatures well above the melting temperature of the ordered chain structures. This mechanism is directly correlated with the ordered phases that appear at much lower temperatures. As a consequence, also the influence of frozen disorder is still visible above the melting temperature. Theoretically we predict a strong dependence of the pre-exponential factor and weak dependence of the activation energy on the concentration of frozen surface defects. These predictions are confirmed by the simulations.
ASJC Scopus Sachgebiete
- Physik und Astronomie (insg.)
- Physik der kondensierten Materie
- Physik und Astronomie (insg.)
- Oberflächen und Grenzflächen
- Werkstoffwissenschaften (insg.)
- Oberflächen, Beschichtungen und Folien
- Werkstoffwissenschaften (insg.)
- Werkstoffchemie
Zitieren
- Standard
- Harvard
- Apa
- Vancouver
- BibTex
- RIS
in: Surface Science, Jahrgang 481, Nr. 1-3, 08.06.2001, S. 124-134.
Publikation: Beitrag in Fachzeitschrift › Artikel › Forschung › Peer-Review
}
TY - JOUR
T1 - Diffusion in a strongly correlated anisotropic overlayer
AU - Lyuksyutov, Igor F.
AU - Everts, H. U.
AU - Pfnür, Herbert
N1 - Funding information: We benefitted from discussions with A.G. Naumovets. The work is supported by the Niedersächsische Ministerium für Wissenschaft and Kultur and by the Volkswagen Stiftung. One of us (I.L.) was partly supported by the grants DE-FG03-96ER45598, NSF DMR-97-05182, THECB ARP 010366-003.
PY - 2001/6/8
Y1 - 2001/6/8
N2 - We study the collective diffusion in chain structures on anisotropic substrates like (1 1 2) bcc and (1 1 0) fcc surfaces with deep troughs in the substrate potential corrugation. These chain structures are aligned normal to the troughs and can move only along the troughs. In a combination of theoretical arguments and of numerical simulations, we study the mass transport in these anisotropic systems. We find that a mechanism similar to soliton diffusion, instead of single particle diffusion, is still effective at temperatures well above the melting temperature of the ordered chain structures. This mechanism is directly correlated with the ordered phases that appear at much lower temperatures. As a consequence, also the influence of frozen disorder is still visible above the melting temperature. Theoretically we predict a strong dependence of the pre-exponential factor and weak dependence of the activation energy on the concentration of frozen surface defects. These predictions are confirmed by the simulations.
AB - We study the collective diffusion in chain structures on anisotropic substrates like (1 1 2) bcc and (1 1 0) fcc surfaces with deep troughs in the substrate potential corrugation. These chain structures are aligned normal to the troughs and can move only along the troughs. In a combination of theoretical arguments and of numerical simulations, we study the mass transport in these anisotropic systems. We find that a mechanism similar to soliton diffusion, instead of single particle diffusion, is still effective at temperatures well above the melting temperature of the ordered chain structures. This mechanism is directly correlated with the ordered phases that appear at much lower temperatures. As a consequence, also the influence of frozen disorder is still visible above the melting temperature. Theoretically we predict a strong dependence of the pre-exponential factor and weak dependence of the activation energy on the concentration of frozen surface defects. These predictions are confirmed by the simulations.
KW - Equilibrium thermodynamics and statistical mechanics
KW - Non-equilibrium thermodynamics and statistical mechanics
KW - Surface defects
KW - Surface diffusion
UR - http://www.scopus.com/inward/record.url?scp=0035838083&partnerID=8YFLogxK
U2 - 10.1016/S0039-6028(01)01018-4
DO - 10.1016/S0039-6028(01)01018-4
M3 - Article
AN - SCOPUS:0035838083
VL - 481
SP - 124
EP - 134
JO - Surface Science
JF - Surface Science
SN - 0039-6028
IS - 1-3
ER -