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Lattice dynamics of LaFeAsO$$_{1-x}$$F$$_x$$ and PrFeAsO$$_{1-y}$$ via inelastic X-ray scattering and first-principles calculation

Fukuda, Tatsuo; Baron, A. Q. R.*; Shamoto, Shinichi; Ishikado, Motoyuki; Nakamura, Hiroki; Machida, Masahiko; Uchiyama, Hiroshi*; Tsutsui, Satoshi*; Iyo, Akira*; Kito, Hijiri*; Mizuki, Junichiro; Arai, Masatoshi; Eisaki, Hiroshi*; Hosono, Hideo*

The lattice dynamics of LaFeAsO$$_{1-x}$$F$$_x$$ ($$x$$=0, 0.1) and PrFeAsO$$_{1-y}$$ ($$ysim$$0.1) are investigated using inelastic X-ray scattering. 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 reducing the strength of the Fe-As bond by 30%.

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Category:Physics, Multidisciplinary

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