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- W2008468525 abstract "We report on a high-resolution helium atom scattering study of the surface lattice dynamics, for both the room temperature $(sqrt{3}ifmmodetimeselsetexttimesfi{}sqrt{3})mathrm{R}30ifmmode^circelsetextdegreefi{}$ and the low-temperature $(3ifmmodetimeselsetexttimesfi{}3)$ structures formed by $1∕3$ of a monolayer of Sn on Ge(111). At room temperature a pronounced lowering of the energy of the transversally polarized phonons along the $overline{ensuremath{Gamma}mathrm{M}}$ direction is observed for wave vectors in the vicinity of $Q=0.6phantom{rule{0.3em}{0ex}}{mathrm{AA{}}}^{ensuremath{-}1}$, the $overline{mathrm{K}}$ point of the room temperature $(sqrt{3}ifmmodetimeselsetexttimesfi{}sqrt{3})mathrm{R}30ifmmode^circelsetextdegreefi{}$ structure. The temperature dependence of this mode is analyzed between 140 and 300 K. We conclude that the softening of this mode is related with the $(sqrt{3}ifmmodetimeselsetexttimesfi{}sqrt{3})mathrm{R}30ifmmode^circelsetextdegreefi{}ensuremath{leftrightarrow}(3ifmmodetimeselsetexttimesfi{}3)$ phase transition. Phonon distributions curves are determined for both phases and the two high symmetry directions. The experimental data are explained from the backfolding of the slightly modified $mathrm{Ge}(111)ensuremath{-}(1ifmmodetimeselsetexttimesfi{}1)$ Rayleigh wave and from the modes related to the Sn induced superstructures, in good agreement with first-principles calculations." @default.
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- W2008468525 date "2005-05-11" @default.
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- W2008468525 title "Phonon dynamics of theSn∕Ge(111)surface at room temperature and low temperature determined by helium-atom scattering" @default.
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- W2008468525 doi "https://doi.org/10.1103/physrevb.71.205402" @default.
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