Surface phase transition and electronic structure of c(5 root 2 x root 2)R45 degrees-Pb/Cu(100)
| Autor: | Joco, V, Martinez-Blanco, J, Segovia, P, Balasubramanian, T, Fujii, J, Michel, EG |
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| Rok vydání: | 2006 |
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| Zdroj: | Surface science 600 (2006): 3851–3855. doi:10.1016/j.susc.2005.11.065 info:cnr-pdr/source/autori:Joco, V; Martinez-Blanco, J; Segovia, P; Balasubramanian, T; Fujii, J; Michel, EG/titolo:Surface phase transition and electronic structure of c(5 root 2 x root 2)R45 degrees-Pb%2FCu(100)/doi:10.1016%2Fj.susc.2005.11.065/rivista:Surface science/anno:2006/pagina_da:3851/pagina_a:3855/intervallo_pagine:3851–3855/volume:600 |
| Popis: | The c(5 root 2 x root 2)R45 degrees-Pb/Cu(100) surface phase is investigated by means of angle resolved ultraviolet photoemission and low energy electron diffraction in the temperature range between 300 and 550 K. We identify and characterize a temperature-induced surface phase transition at 440 K from the room temperature e(5 root 2 x root 2) R45 degrees phase to a (root 2 x root 2)R45 degrees structure with split superstructure spots. The phase transition is fully reversible and takes place before the two-dimensional melting of the structure at 520 K. The electronic structure of the split (root 2 x root 2)R45 degrees phase is characterized by a metallic free-electron like surface band. This surface band is backfolded with c(5 root 2 x root 2)R45 degrees periodicity phase at room temperature, giving rise to a surface band gap at the Fermi energy. We propose that a gain in electronic energy explains in part the stability of the c(5 root 2 x root 2)R45 degrees phase. (c) 2006 Elsevier B.V. All rights reserved. |
| Databáze: | OpenAIRE |
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