Modulated Phases on the FCC(110) Surfaces with Adsorbate-Induced Reconstructions

Min Kang and Makoto Kaburagi
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Min Kang: Faculty of Cross-Cultural Studies, Kobe University, 1-2-1 Tsurukabuto, Nada, Kobe, 657-8501, Japan
Makoto Kaburagi: Faculty of Cross-Cultural Studies, Kobe University, Nada, Graduate School of Science and Technology, Kobe University, Nada, Kobe, 657-8501, Japan

Surface Review and Letters (SRL), 2003, vol. 10, issue 02n03, 189-194

Abstract: We theoretically investigate the fcc(110) surfaces with missing row reconstructions induced by adatoms using the Blume–Emmery–Griffith (BEG) model. In the model,Kijis introduced to denote interactions between surface atoms andJijto describe interactions between dipoles. The investigation by the mean field approximation has predicted that there appear modulated phases on the surfaces as the next-nearest-neighbor (NNN) and the nearest-neighbor (NN) interactions along the [001] direction become competitive. In this study, Monte Carlo simulations are performed to confirm the prediction. A correlation function defined by concentration operators in wave vectorqspace is calculated. The results show that the concentration modulations appear. The temperature versus the ratio of the NNN interactionK2to the NN interactionK1phase diagram is obtained. The possible features of the modulated phases in experiments are discussed.

Date: 2003
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DOI: 10.1142/S0218625X03005268

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