Journal
PHYSICAL REVIEW B
Volume 80, Issue 22, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.80.220504
Keywords
doping; fluorine; iron compounds; lattice dynamics; phonon dispersion relations; samarium compounds; superconducting materials; X-ray scattering
Funding
- U.S. Department of Energy, Division of Materials Science [DE-AC02-98CH10886]
- Swiss National Science Foundation (NCCR MaNEP)
- Royal Society
- EPSRC
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We report inelastic x-ray scattering experiments on the lattice dynamics in SmFeAsO and superconducting SmFeAsO0.60F0.35 single crystals. Particular attention was paid to the dispersions along the [100] direction of three optical modes close to 23 meV, polarized out of the FeAs planes. Remarkably, two of these modes are strongly renormalized upon fluorine doping. These results provide significant insight into the energy and momentum dependence of the coupling of the lattice to the electron system and underline the importance of spin-phonon coupling in the superconducting iron pnictides.
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