57Fe nuclear resonant inelastic scattering of Fe1.1Te

Masayuki Kurokuzu, Shinji Kitao, Yasuhiro Kobayashi, Makina Saito, Ryo Masuda, Takaya Mitsui, Yoshitaka Yoda, Makoto Seto

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1 Citation (Scopus)

Abstract

This study reports results of 57Fe Mössbauer spectroscopy and nuclear resonant inelastic scattering (NRIS) in Fe1.1Te. The Fe-specific partial phonon densities of states (PDOSs) were extracted from the observed spectra. No detectable change at the tetragonal-monoclinic phase transition around 65 K was observed. Therefore the variations in lattice constants and/or distortion in FeTe4 tetrahedron through the structural transition was minute. From the observed Fe-PDOS, the Lamb-Mössbauer factor was 0.90(3) at 10 K and the Debye temperature was evaluated as 300(10) K. In 57Fe Mössbauer spectroscopy, the clear magnetic spittings of spectra were measured below Néel temperature. The obtained values of isomer shifts showed characteristics of Fe2+ species and clear difference with the phase transition was observed in temperature dependence of quadrupole splitting (QS). The change of QS must be caused by substantial change of the charge density distribution around the Fe site. This suggests that the band structure or the nature of the Fe-Te bonds becomes highly anisotropic. These results might provide additional information about the respective mechanisms for FeTe1−xSex superconductivity.

Original languageEnglish
Article number9
JournalHyperfine Interactions
Volume239
Issue number1
DOIs
Publication statusPublished - 2018 Dec 1
Externally publishedYes

Keywords

  • Iron based superconductors
  • Nuclear resonant inelastic scattering
  • Synchrotron radiation

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Nuclear and High Energy Physics
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry

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