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

doi:10.1143/JPSJ.79.014714

Effect of K doping on phonons in Ba_1-xK_xFe 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

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

11 Citations (Scopus)

Abstract

The lattice dynamics of Ba_1-xK_xFe₂As 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 language	English
Article number	014714
Journal	journal of the physical society of japan
Volume	79
Issue number	1
DOIs	https://doi.org/10.1143/JPSJ.79.014714
Publication status	Published - Jan 2010
Externally published	Yes

Keywords

Fe-based superconductor
Inelastic X-ray scattering
Phonon dispersion

ASJC Scopus subject areas

Physics and Astronomy(all)

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Effect of K doping on phonons in Ba_1-xK_xFe ₂As₂. / Lee, Chul Ho; Kihou, Kunihiro; Horigane, Kazumasa; Tsutsui, Satoshi; Fukuda, Tatsuo; Eisaki, Hiroshi; Iyo, Akira; Yamaguchi, Hirotaka; Baron, Alfred Q.R.; Braden, Markus; Yamada, Kazuyoshi.

In: journal of the physical society of japan, Vol. 79, No. 1, 014714, 01.2010.

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

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abstract = "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 K{\'a}rm{\'a}n 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.",

keywords = "Fe-based superconductor, Inelastic X-ray scattering, Phonon dispersion",

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

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AU - Lee, Chul Ho

AU - Kihou, Kunihiro

AU - Horigane, Kazumasa

AU - Tsutsui, Satoshi

AU - Fukuda, Tatsuo

AU - Eisaki, Hiroshi

AU - Iyo, Akira

AU - Yamaguchi, Hirotaka

AU - Baron, Alfred Q.R.

AU - Braden, Markus

AU - Yamada, Kazuyoshi

PY - 2010/1

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N2 - 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.

AB - 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.

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