TY - JOUR
T1 - The metal-insulator transition in Fe1.01-xCuxSe
AU - Williams, A. J.
AU - McQueen, T. M.
AU - Ksenofontov, V.
AU - Felser, C.
AU - Cava, R. J.
PY - 2009
Y1 - 2009
N2 - 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.
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.
UR - http://www.scopus.com/inward/record.url?scp=67651177774&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=67651177774&partnerID=8YFLogxK
U2 - 10.1088/0953-8984/21/30/305701
DO - 10.1088/0953-8984/21/30/305701
M3 - Article
C2 - 21828556
AN - SCOPUS:67651177774
SN - 0953-8984
VL - 21
JO - Journal of Physics Condensed Matter
JF - Journal of Physics Condensed Matter
IS - 30
M1 - 305701
ER -