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

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*

We studied the lattice dynamics of powders, LaFeAsO $_{1-x}$ F (=0, 0.1) and PrFeAsO $_{1-y}$ (0.4), and a single crystal, PrFeAsO $_{1-y}$ (0.1), using inelastic X-ray scattering. The third peak in phonon density of states are found to be softened by 5 meV compared with ab-initio calculations. A model that agrees reasonably well with all of the data is built from results of ab-initio calculations by reducing the strength of the Fe-As bond by 30%.

Language	:	Japanese
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Meeting title	:	日本物理学会2008年秋季大会(物性)
Held date	:	2008/09
Location (city)	:	盛岡
Location (country)	:	日本
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Keywords	:	no keyword
Research Facility	:	SPring-8(大型放射光施設)
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Registration No. : BB20082488
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Lattice dynamics of LaFeAsOF and PrFeAsO via inelastic X-ray scattering

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