Lattice Dynamics of LaFeAsO1-xFx and PrFeAsO1-y via Inelastic X-Ray Scattering and First-Principles Calculation

被引：41

作者：

Fukuda, Tatsuo ^{[1
,2
]}

Baron, Alfred Q. R. ^{[1
,3
]}

Shamoto, Shin-ichi ^{[4
]}

Ishikado, Motoyuki ^{[4
]}

Nakamura, Hiroki ^{[5
,6
]}

Machida, Masahiko ^{[5
,6
]}

Uchiyama, Hiroshi ^{[1
,3
]}

Tsutsui, Satoshi ^{[3
]}

Iyo, Akira ^{[7
]}

Kito, Hijiri ^{[7
]}

Mizuki, Jun'ichiro ^{[2
]}

Arai, Masatoshi ^{[8
]}

Eisaki, Hiroshi ^{[7
]}

Hosono, Hideo ^{[9
,10
]}

机构：

[1] SPring 8, RIKEN, Mat Dynam Lab, Sayo, Hyogo 6795148, Japan

[2] SPring 8, JAEA, Synchrotron Radiat Res Unit, Sayo, Hyogo 6795148, Japan

[3] SPring 8, JASRI, Res & Utilizat Div, Sayo, Hyogo 6795148, Japan

[4] JAEA, Neutron Mat Res Ctr, Naka, Ibaraki 3191195, Japan

[5] JAEA, JST, CREST, Tokyo 1101195, Japan

[6] JAEA, Ctr Computat Sci and e Syst, Tokyo 1101195, Japan

[7] AIST, Nanoelect Res Inst, Tsukuba, Ibaraki 3058568, Japan

[8] JAEA, J PARC Ctr, Naka, Ibaraki 3191195, Japan

[9] Tokyo Inst Technol, JST, ERATO SORST, Yokohama, Kanagawa 2268503, Japan

[10] Tokyo Inst Technol, Frontier Res Ctr, Yokohama, Kanagawa 2268503, Japan

来源：

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN | 2008年 / 77卷 / 10期

关键词：

phonon density of states; dispersion relation; softening; iron-based superconductor; inelastic x-ray scattering; first-principles calculation;

D O I：

10.1143/JPSJ.77.103715

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The lattice dynamics of LaFeAsO1-xFx (x = 0, 0.1) and PrFeAsO1-y (y similar to 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 PrFeAsO1-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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页数：4

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