Phonon density of states in NdFeAsO1-xFx

M. Le Tacon, M. Krisch, A. Bosak, J. -W. G. Bos, S. Margadonna

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Abstract

We report measurements of the phonon density of states in iron oxypnictide superconductors by inelastic x-ray scattering. 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.

Original languageEnglish
Article number140505
Pages (from-to)-
Number of pages4
JournalPhysical Review B: Condensed Matter and Materials Physics
Volume78
Issue number14
DOIs
Publication statusPublished - Oct 2008

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