Critical scattering at the order-disorder phase transition of Si(111)-√3×√3R30°-Au surface: A phase transition with particle exchange

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Nakajima, Y.; Voges, C.; Nagai, T.; Hasegawa, S.; Klos, G.; Pfnür, H.: Critical scattering at the order-disorder phase transition of Si(111)-√3×√3R30°-Au surface: A phase transition with particle exchange. In: Physical Review B 55 (1997), Nr. 13, 8129. DOI: https://doi.org/10.1103/PhysRevB.55.8129

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Abstract: 
The Si(111)-√3×√3-Au phase, which coexists with three-dimensional islands of excess Au at coverages above 1 monolayer and at temperatures above 700 K, is shown to undergo a temperature driven order-disorder phase transition at 1057 K. The islands act as a reservoir of Au atoms and adjust the chemical potential for the two-dimensional layer during the transition. Due to this particle exchange, the phase transition within the √3×√3R30°-Au has been observed for a chemisorbed layer which is not under the usual constraint of constant coverage, but controlled by the chemical potential. We quantitatively analyzed the critical scattering and experimentally determined its critical exponents Β, γ, and ν by high-resolution low-energy electron diffraction. Their values are in good agreement with the expected values of the three-state Potts model, which shows that the transition is continuous without any finite-size effects detectable.
License of this version: Es gilt deutsches Urheberrecht. Das Dokument darf zum eigenen Gebrauch kostenfrei genutzt, aber nicht im Internet bereitgestellt oder an Außenstehende weitergegeben werden.
Document Type: article
Publishing status: publishedVersion
Issue Date: 1997
Appears in Collections:Fakultät für Mathematik und Physik

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1 image of flag of Germany Germany 33 82.50%
2 image of flag of United States United States 3 7.50%
3 image of flag of Latvia Latvia 1 2.50%
4 image of flag of Korea, Republic of Korea, Republic of 1 2.50%
5 image of flag of Denmark Denmark 1 2.50%
6 image of flag of China China 1 2.50%

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