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Phase transition of Pt/Ge(001) surface studied by reflection high-energy positron diffraction

Mochizuki, Izumi; Fukaya, Yuki   ; Kawasuso, Atsuo; Yaji, Koichiro*; Harasawa, Ayumi*; Matsuda, Iwao*; Wada, Ken*; Hyodo, Toshio*

Defect-free quasi-one chain with the single atomic width is reconstructed on the Ge(001) surface by a Pt adsorption of sub-atomic layer. Recently, it has been reported that the atomic chain undergoes the Peierls transition about 80 K. But, the electronic property, the atomic arrangements and displacements in the phase transition are not yet elucidated. Using reflection high-energy positron diffraction (RHEPD), we have reported that the Nano-Wire (NW) model is the fundamental structure of the observed nanowires. In this study, we have tried to determine the atomic arrangement and the transition phenomenon using RHEPD. The rocking curve shows a good agreement with the calculated curve assuming the NW model with the Pt coverage of 0.75 ML. In addition, the change of rocking curves in the phase transition shows that the structural phase transition is caused by the height difference of the topmost Ge dimer atoms.

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