The metal-insulator transition in Fe1.01-xCuxSe

A. J. Williams, T. M. McQueen, V. Ksenofontov, C. Felser, R. J. Cava

Research output: Contribution to journalArticlepeer-review

80 Scopus citations


Iron selenide, Fe1.01Se, 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 of 8K. Here we show that copper can be substituted at the iron site in Fe1.01Se up to a solubility limit of 20-30%, after which a first-order transition to the three-dimensional CuFeSe2 structure type is observed. As little as 1.5% copper is sufficient to suppress the superconductivity, and 4% drives the system through a metal-insulator transition. A local magnetic moment is introduced, which maximizes near 12%doping, where a spin-glass transition near 15K is observed.

Original languageEnglish (US)
Article number305701
JournalJournal of Physics Condensed Matter
Issue number30
StatePublished - 2009

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • General Materials Science


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