Phonon density of states in NdFeAsO1-xFx

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

doi:10.1103/PhysRevB.78.140505

Phonon density of states in NdFeAsO1-xFx

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

Research output: Contribution to journal › Article › peer-review

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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 language	English
Article number	140505
Pages (from-to)	-
Number of pages	4
Journal	Physical Review B: Condensed Matter and Materials Physics
Volume	78
Issue number	14
DOIs	https://doi.org/10.1103/PhysRevB.78.140505
Publication status	Published - Oct 2008

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10.1103/PhysRevB.78.140505

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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.",

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AU - Le Tacon, M.

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AU - Bosak, A.

AU - Bos, J. -W. G.

AU - Margadonna, S.

PY - 2008/10

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N2 - 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.

AB - 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.

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DO - 10.1103/PhysRevB.78.140505

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JO - Physical Review B: Condensed Matter and Materials Physics

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Phonon density of states in NdFeAsO1-xFx

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