Effect of K doping on phonons in Ba1-xKxFe 2As2

Chul Ho Lee, Kunihiro Kihou, Kazumasa Horigane, Satoshi Tsutsui, Tatsuo Fukuda, Hiroshi Eisaki, Akira Iyo, Hirotaka Yamaguchi, Alfred Q.R. Baron, Markus Braden, Kazuyoshi Yamada

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11 Citations (Scopus)


The lattice dynamics of Ba1-xKxFe2As 2 (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 Kármán 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.

Original languageEnglish
Article number014714
Journaljournal of the physical society of japan
Issue number1
Publication statusPublished - Jan 2010
Externally publishedYes


  • Fe-based superconductor
  • Inelastic X-ray scattering
  • Phonon dispersion

ASJC Scopus subject areas

  • General Physics and Astronomy


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