The metal-insulator transition in Fe1.01-xCuxSe

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

Research output: Contribution to journalArticle

64 Citations (Scopus)

Abstract

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
Volume21
Issue number30
DOIs
StatePublished - Jul 30 2009

Fingerprint

Metal insulator transition
Copper
Iron
insulators
Spin glass
Superconductivity
Magnetic moments
metals
iron
Glass transition
copper
selenides
Solubility
Doping (additives)
spin glass
critical temperature
superconductivity
solubility
magnetic moments
Temperature

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Materials Science(all)

Cite this

Williams, A. J. ; McQueen, T. M. ; Ksenofontov, V. ; Felser, C. ; Cava, Robert Joseph. / The metal-insulator transition in Fe1.01-xCuxSe. In: Journal of Physics Condensed Matter. 2009 ; Vol. 21, No. 30.
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The metal-insulator transition in Fe1.01-xCuxSe. / Williams, A. J.; McQueen, T. M.; Ksenofontov, V.; Felser, C.; Cava, Robert Joseph.

In: Journal of Physics Condensed Matter, Vol. 21, No. 30, 305701, 30.07.2009.

Research output: Contribution to journalArticle

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AU - Cava, Robert Joseph

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AB - 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.

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