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- W1497238 abstract "We measured element-specific Fe-phonon densities of states (Fe-PDOSs) of ${text{LaFeAsO}}_{1ensuremath{-}x}{text{F}}_{x}$ $(x=0,0.11)$ and ${text{La}}_{1ensuremath{-}x}{text{Ca}}_{x}text{FePO}$ $(x=0.13)$ by nuclear resonant inelastic scattering of synchrotron radiation. Since the bands crossing the Fermi edge are mainly $text{Fe}text{ }3d$ bands, Fe is the key element for iron pnictide superconductivity, and therefore element-specific Fe-PDOS offers crucial information on the phonon contribution in iron pnictide superconductors. The measured Fe-PDOSs of superconductor ${text{LaFeAsO}}_{0.89}{text{F}}_{0.11}$ $({T}_{c}=26text{ }text{K})$ and that of nonsuperconductor LaFeAsO have similar structures both below ${T}_{c}$ (15 K) and above ${T}_{c}$ (298 K); therefore, fluorine doping does not have a notable effect on the Fe-PDOS. The measured Fe-PDOS of ${text{LaFeAsO}}_{1ensuremath{-}x}{text{F}}_{x}$ agrees well with Fe-PDOS spectrum determined from a previous first-principles calculation and shows structural resemblance with a calculated 'Eliashberg function ${ensuremath{alpha}}^{2}F(ensuremath{omega})$, which indicates small electron-phonon coupling. Therefore, our results indicate that phonons are not the main contributors to the high-${T}_{c}$ superconductivity of ${text{LaFeAsO}}_{1ensuremath{-}x}{text{F}}_{x}$." @default.
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- W1497238 date "2008-11-07" @default.
- W1497238 modified "2023-09-23" @default.
- W1497238 title "Iron-specific phonon density of states in the superconductorsLaFeAsO1−xFxandLa1−xCaxFePO" @default.
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- W1497238 doi "https://doi.org/10.1103/physrevb.78.174507" @default.
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