Lattice Dynamics of LaFeAsO_{1-x}F_{x} and PrFeAsO_{1-y} via Inelastic X-Ray Scattering and First-Principles Calculation

Authors :: Fukuda, T.
Baron, A. Q. R.
Shamoto, S.
Ishikado, M.
Nakamura, H.
Machida, M.
Uchiyama, H.
Tsutsui, S.
Iyo, A.
Kito, H.
Mizuki, J.
Arai, M.
Eisaki, H.
Hosono, H.
Source :: J. Phys. Soc. Jpn. 77 (2008) 103715
Publication Year :: 2008
Abstract: The lattice dynamics of LaFeAsO_{1-x}F_{x} (x=0, 0.1) and PrFeAsO_{1-y} (y~0.1) are investigated using inelastic x-ray scattering and ab-initio calculation. Measurements of powder samples provide an approximation to the phonon DOS, while dispersion is measured from a single crystal of PrFeAsO_{1-y}. A model that agrees reasonably well with all of the data at room temperature is built from results of ab-initio calculations by softening the strength of the Fe-As bond by 30%.<br />Comment: 4 pages, 4 figures; some changes of the text and a revision of figure 2

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