Relationship between structure and superconductivity in FeSei-Te

Kazumasa Horigane, Haruhiro Hiraka, Kenji Ohoyama

Research output: Contribution to journalArticle

79 Citations (Scopus)

Abstract

We determined the crystal structural parameters of FeSe 1-xTe x(x = 0:5, 0.625, 0.75, 0.875) and FeSe by using the neutron powder diffraction technique. It was found that the superconducting transition temperature T c of Fe 1-xTe x increased with the (S e, T e)-F e-(S e, T e) bond angle a in the Te-doped samples. However, T c of F eS e did not exhibit a similar relation. In order to explain this contradiction, we studied the temperature dependence of the z position of chalcogens, which is strongly coupled to the spin fluctuation by theoretical calculations. The z position in F eS e showed a remarkable shift, indicating that strong spin fluctuation can affect the superconductivity in F eS e.

Original languageEnglish
Article number074718
Journaljournal of the physical society of japan
Volume78
Issue number7
DOIs
Publication statusPublished - Jul 1 2009
Externally publishedYes

Keywords

  • Crystal structure analysis
  • Iron-based superconductor
  • Neutron powder diffraction

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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