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- W1566205881 abstract "We have performed Raman-scattering measurements on a high-quality single crystal of the recently discovered Fe-based superconductor K${}_{0.8}$Fe${}_{1.6}$Se${}_{2}$ (${T}_{c}$ $=$ 32 K). At least 13 phonon modes were observed in the wave number range 10--300 cm${}^{ensuremath{-}1}$. The spectra possess a fourfold symmetry indicative of bulk vacancy order in the Fe-deficient planes. We perform a vibration analysis based on first-principles calculations, which both confirms the ordered structure and allows a complete mode assignment. We observe an anomaly at ${T}_{c}$ in the 180 cm${}^{ensuremath{-}1}$ ${A}_{g}$ mode, which indicates a rather specific type of electron-phonon coupling." @default.
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- W1566205881 date "2012-01-11" @default.
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- W1566205881 title "Vacancy ordering and phonon spectrum of the iron-based superconductor K<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:msub><mml:mrow /><mml:mrow><mml:mn>0.8</mml:mn></mml:mrow></mml:msub></mml:math>Fe<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:msub><mml:mrow /><mml:mrow><mml:mn>1.6</mml:mn></mml:mrow></mml:msub></mml:math>Se<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:msub><mml:mrow /><mml:mn>2…" @default.
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- W1566205881 doi "https://doi.org/10.1103/physrevb.85.024518" @default.
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