Phonon Density of States in Nd(O$_{1-x}$F$_{x}$)FeAs

Details Phonon Density of States in Nd(O$_{1-x}$F$_{x}$)FeAs Phonon Density of States in Nd(O$_{1-x}$F$_{x}$)FeAs

2008-09-17

arxiv.org/abs/0809.2898v1

Physics

Condensed Matter

Superconductivity

4 pages, 4 figures. Originally submitted 07 Jul 08, accepted for publication in Phys. Rev. B (R)

Scientific paper

10.1103/PhysRevB.78.140505

We report measurements of the phonon density-of-states in iron oxypnictide superconductors by inelastic x-ray scattering. A good agreement with ab-initio calculations that do not take into account strong electronic correlations is found, and an unpredicted softening of phonon branches under F doping of these compounds is observed. Raman scattering experiments lead us to conclude that this softening is not related to zone center phonons, and consequently imply an important softening of the relevant phonon branches at finite momentum transfer Q.

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