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- W2028156905 abstract "By using quantitative low energy electron diffraction, we have studied the temperature-driven phase transition of Pb chains grown on Si(557) substrates at a surface concentration of 1.3 ML. This concentration, which is still below one physical monolayer, exhibits a unique switching of electrical conductance from one dimensional to two dimensional above 78 K, which is coupled to this phase transition, and was investigated for this reason. Annealing to 640 K causes a concentration-driven refacetting of the whole surface into large (223) facets at low temperatures, while along the chains a so-called (1,5) linear phase is formed, causing a tenfold periodicity. At ${T}_{c}=78text{ }text{K}$, we analyze a temperature-driven order-order transition along the $[overline{1}overline{1}2]$ direction in detail, which again turns out to be a refacetting transition. The two-dimensional character of this transition was seen by corresponding structural changes along the $[1overline{1}0]$ direction as well. Refacetting causes a change in periodicity and destroys the conditions of Fermi nesting necessary for one-dimensional conductance." @default.
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- W2028156905 date "2008-05-13" @default.
- W2028156905 modified "2023-09-25" @default.
- W2028156905 title "Temperature-driven refacetting phase transition in Pb chains on Si(557)" @default.
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- W2028156905 doi "https://doi.org/10.1103/physrevb.77.174108" @default.
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