Journal
JOURNAL OF PHYSICS-CONDENSED MATTER
Volume 21, Issue 30, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0953-8984/21/30/305701
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Funding
- US Department of Energy
- Division of Basic Energy Sciences [DEFG02-98ER45706]
- National Science Foundation Graduate Research Fellowship programme.
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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.
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