Metal - Insulator transition in Fe1.01-xCuxSe

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 8 K. 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 % percent 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 15 K is observed.

References in corpus (10)

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Cited by in corpus (8)

• Effect of 3d Metal (Co and Ni) Doping on the Superconductivity of FeSe0.5Te0.5
• Magnetic order tuned by Cu substitution in Fe1.1-zCuzTe
• Synthesis, structural and physical properties of ${\delta }^{\prime }$-FeSe${}_{1-x}$
• Local breaking of four-fold rotational symmetry by short-range magnetic order in heavily overdoped Ba(Fe${}_{1-x}$Cu${}_x$)${}_2$As${}_2$
• The role of correlations in the high-pressure phase of FeSe
• Substitution of Ni for Fe in superconducting Fe${}_{0.98}$Te${}_{0.5}$Se${}_{0.5}$ depresses the normal-state conductivity but not the magnetic spectral weight
• Orbital-selective Mott phase of Cu-substituted iron-based Superconductors
• On the bad metallicity and phase diagrams of Fe${}_{1+\delta }X$ ($X$ =Te, Se, S, solid solutions): an electrical resistivity study