Mössbauer spectroscopy of La 0.87Ca 0.13FePO and LaFeAsO 0.93F 0.07 under external magnetic field and nuclear resonant inelastic scattering of La 0.87Ca 0.13FePO

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

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4 Citations (Scopus)

Abstract

An 57Fe Mössbauer spectroscopic study of iron-based layered superconductors La 0.87Ca 0.13FePO and LaFeAsO 0.93F 0.07 under external magnetic fields of up to 14 T was performed. Our results suggest that hyperfine fields induced by local magnetic moments are, if any, small and that the magnetic feature of Fe in La 0.87Ca 0.13FePO and LaFeAsO 0.93F 0.07 is most likely to be paramagnetism with itinerant electrons. This feature is confirmed both above and below the transition temperature for LaFeAsO 0.93F 0.07. Furthermore, the temperature dependence of the iron-specific phonon density of states in La 0.87Ca 0.13-FePO was measured by using the nuclear resonant inelastic scattering of synchrotron radiation. We have found that the temperature- dependent change in the iron-specific phonon density of states of La 0.87Ca 0.13FePO was smaller than that of LaFeAsO 0.89F 0.11.

Original languageEnglish
Article number024704
JournalJournal of the Physical Society of Japan
Volume78
Issue number2
DOIs
Publication statusPublished - 2009 Feb 1
Externally publishedYes

Keywords

  • Ca doping
  • F doping
  • Fe Mössbauer spectroscopy
  • La Ca FePO
  • LaFeAsO f
  • Magnetic moment
  • Nuclear resonant scattering
  • Phonon density of states
  • Superconductivity

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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