Surface phase transition and electronic structure of c(5 root 2 x root 2)R45 degrees-Pb/Cu(100)

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.

Martinez-Blanco, J (författare)
Segovia, P. (författare)
Thiagarajan, BalasubramanianLund University,Lunds universitet,MAX IV-laboratoriet,MAX IV Laboratory(Swepub:lu)maxl-bth (författare)
Fujii, J. (författare)
Michel, E. G. (författare)
Lunds universitetMAX IV-laboratoriet (creator_code:org_t)

Ingår i:Proceedings of the 23th European Conference on Surface Science (Surface Science): Elsevier BV600:18, s. 3851-38550039-6028

Av författaren/redakt...: Joco, V.; Martinez-Blanco, ...; Segovia, P.; Thiagarajan, Bal ...; Fujii, J.; Michel, E. G.

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