Metal - Insulator transition in Fe1.01-xCuxSe

Details Metal - Insulator transition in Fe1.01-xCuxSe Metal - Insulator transition in Fe1.01-xCuxSe

2009-05-12

arxiv.org/abs/0905.1875v1

J. Phys.: Condens. Matter 21 305701 2009

Physics

Condensed Matter

Superconductivity

Scientific paper

10.1088/0953-8984/21/30/305701

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.

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