Iron-specific phonon density of states in the superconductors LaFeAsO 1-xFx and La1-xCaxFePO

Satoshi Higashitaniguchi, Makoto Seto, Shinji Kitao, Yasuhiro Kobayashi, Makina Saito, Ryo Masuda, Takaya Mitsui, Yoshitaka Yoda, Yoichi Kamihara, Masahiro Hirano, Hideo Hosono

Research output: Contribution to journalArticle

24 Citations (Scopus)

Abstract

We measured element-specific Fe-phonon densities of states (Fe-PDOSs) of LaFeAsO1-x Fx (x=0,0.11) and La1-x Cax FePO (x=0.13) by nuclear resonant inelastic scattering of synchrotron radiation. Since the bands crossing the Fermi edge are mainly Fe3d bands, Fe is the key element for iron pnictide superconductivity, and therefore element-specific Fe-PDOS offers crucial information on the phonon contribution in iron pnictide superconductors. The measured Fe-PDOSs of superconductor LaFeAsO0.89 F0.11 (Tc =26 K) and that of nonsuperconductor LaFeAsO have similar structures both below Tc (15 K) and above Tc (298 K); therefore, fluorine doping does not have a notable effect on the Fe-PDOS. The measured Fe-PDOS of LaFeAsO1-x Fx agrees well with Fe-PDOS spectrum determined from a previous first-principles calculation and shows structural resemblance with a calculated Iliashberg function α2 F (ω), which indicates small electron-phonon coupling. Therefore, our results indicate that phonons are not the main contributors to the high- Tc superconductivity of LaFeAsO1-x Fx.

Original languageEnglish
Article number174507
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume78
Issue number17
DOIs
Publication statusPublished - 2008 Nov 7
Externally publishedYes

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Group 5A compounds
Superconductivity
Superconducting materials
superconductivity
Iron
iron
Inelastic scattering
Fluorine
Phonons
Synchrotron radiation
fluorine
synchrotron radiation
inelastic scattering
phonons
Doping (additives)
Electrons
electrons

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

Cite this

Iron-specific phonon density of states in the superconductors LaFeAsO 1-xFx and La1-xCaxFePO. / Higashitaniguchi, Satoshi; Seto, Makoto; Kitao, Shinji; Kobayashi, Yasuhiro; Saito, Makina; Masuda, Ryo; Mitsui, Takaya; Yoda, Yoshitaka; Kamihara, Yoichi; Hirano, Masahiro; Hosono, Hideo.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 78, No. 17, 174507, 07.11.2008.

Research output: Contribution to journalArticle

Higashitaniguchi, S, Seto, M, Kitao, S, Kobayashi, Y, Saito, M, Masuda, R, Mitsui, T, Yoda, Y, Kamihara, Y, Hirano, M & Hosono, H 2008, 'Iron-specific phonon density of states in the superconductors LaFeAsO 1-xFx and La1-xCaxFePO', Physical Review B - Condensed Matter and Materials Physics, vol. 78, no. 17, 174507. https://doi.org/10.1103/PhysRevB.78.174507
Higashitaniguchi, Satoshi ; Seto, Makoto ; Kitao, Shinji ; Kobayashi, Yasuhiro ; Saito, Makina ; Masuda, Ryo ; Mitsui, Takaya ; Yoda, Yoshitaka ; Kamihara, Yoichi ; Hirano, Masahiro ; Hosono, Hideo. / Iron-specific phonon density of states in the superconductors LaFeAsO 1-xFx and La1-xCaxFePO. In: Physical Review B - Condensed Matter and Materials Physics. 2008 ; Vol. 78, No. 17.
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