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The metal-insulator transition in Fe1.01-xCuxSe

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Williams, A. J., McQueen, T. M., Ksenofontov, V., Felser, C., & Cava, R. J. (2009). The metal-insulator transition in Fe1.01-xCuxSe. Journal of Physics: Condensed Matter, 21(30): 305701, pp. 1-6. doi:10.1088/0953-8984/21/30/305701.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0018-9BA5-0
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% 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.