Effect of K Doping on Phonons in Ba1-xKxFe2As2

Details Effect of K Doping on Phonons in Ba1-xKxFe2As2 Effect of K Doping on Phonons in Ba1-xKxFe2As2

2009-11-17

arxiv.org/abs/0911.3215v1

J. Phys. Soc. Jpn. 79 (2010) 014714

Physics

Condensed Matter

Superconductivity

J. Phys. Soc. Jpn. (in press)

Scientific paper

10.1143/JPSJ.79.014714

The lattice dynamics of Ba1-xKxFe2As2 (x = 0.00, 0.27) have been studied by inelastic X-ray scattering measurement at room temperature. K doping induces the softening and broadening of phonon modes in the energy range E = 10-15 meV. Analysis with a Born-von Karman force-constant model indicates that the softening results from reduced interatomic force constants around (Ba,K) sites following the displacement of divalent Ba by monovalent K. The phonon broadening may be explained by the local distortions induced by the K substitution. Extra phonon modes are observed around the wave vector q = (0.5,0,0) at E = 16.5 meV for the x = 0.27 sample. These modes may arise either from the local disorder induced by K doping or from electron-phonon coupling.

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