PHASE DIAGRAM OF ADSORBATE-INDUCED ROW-TYPE ALIGNMENTS

M. Kang (), K. Yasutani and M. Kaburagi
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M. Kang: Kansai University of International Studies, Shijimi, Miki 673-0521, Japan
K. Yasutani: Graduate School of Science and Technology, Kobe University Rokkodai, Nada, Kobe 657-8501, Japan
M. Kaburagi: Graduate School of Science and Technology, Kobe University Rokkodai, Nada, Kobe 657-8501, Japan;

Surface Review and Letters (SRL), 1999, vol. 06, issue 05, 691-697

Abstract: The phase diagram of adsorbate-induced row-type alignments, such as missing-row reconstructions induced by adsorbate atoms on the FCC(110) surface, is calculated by the Blume–Emmery–Griffiths (BEG) model. In the model, we introduce adatom–adatom and dipole–dipole interactions between nearest-neighbor (NN) and next-nearest-neighbor (NNN) rows. The calculation of the temperature versus adatom chemical potential phase diagram is performed using mean-field approximation. It is indicated that when NN and NNN interactions are competitive, there appear either dipole or coverage modulated (incommensurate) phases at high temperatures for a wide regime of the interactions.

Date: 1999
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DOI: 10.1142/S0218625X99000676

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