The stoichiometry of FeSe

A. J. Williams, T. M. McQueen, R. J. Cava

Research output: Contribution to journalArticlepeer-review

90 Scopus citations


Tetragonal iron selenide, FeSe, the layered parent compound of the recently discovered superconducting arsenide family, has previously been shown to be non-magnetic and superconducting with a critical temperature near 8 K. There has, however, been a lack of consensus as to whether selenium vacancies present due to large deviations from ideal stoichiometry are required to give rise to the superconductivity. Here we describe the results of experiments that demonstrate simply that superconducting iron selenide can only be synthesized as a pure material when near stoichiometric (i.e. FeSe). Significant selenium deficiency or excess gives rise to secondary magnetic phases, and a suppression of the superconductivity.

Original languageEnglish (US)
Pages (from-to)1507-1509
Number of pages3
JournalSolid State Communications
Issue number37-38
StatePublished - Oct 2009

All Science Journal Classification (ASJC) codes

  • General Chemistry
  • Condensed Matter Physics
  • Materials Chemistry


  • A. Superconductors
  • B. Chemical synthesis


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