Structural and superconductivity study on α-FeSex

Zhaofei Li, Jing Ju, Jun Tang, Kazumi Sato, Masanori Watahiki, Katsumi Tanigaki

Research output: Contribution to journalArticlepeer-review

28 Citations (Scopus)

Abstract

We have successfully synthesized the α-FeSex binary tetragonal superconductors with nominal composition of FeSex (x=0.6-1.0) via conventional solid state reactions between Fe and Se sealed in quartz tubes. Fe and β-FeSe are the most commonly seen impurities in this binary system. A low-temperature annealing at 400 °C is found to be crucial to remove β-FeSe, which is the thermodynamic stable phase with hexagonal symmetry. For all the samples of FeSex, superconductivity is confirmed by magnetic measurements as well as resistivity measurements with their Tc at around 8 K. We noticed that their Tc does not vary with the different nominal Se amount. High-resolution synchrotron X-ray diffraction analysis revealed that the unit cell parameters of all these samples do not change within the error range, and their structure only tolerate the same very small amount of Se deficiency. Based on this study, we concluded that the α-FeSex superconductor only exist in a very narrow deficiency range.

Original languageEnglish
Pages (from-to)495-498
Number of pages4
JournalJournal of Physics and Chemistry of Solids
Volume71
Issue number4
DOIs
Publication statusPublished - 2010 Apr 1

Keywords

  • C. X-ray diffraction
  • D. Crystal structure
  • D. Defects
  • D. Superconductivity

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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