The magnetic interactions between iron and cobalt in the ternary iron arsenide, (Fe1-x Cox)2As, above the Curie temperature
In the Fe-Co-As system the Fe2P-type structure is stable in the composition range (Fe1-xCox)2As, 0.35<x<0.9, even though the binary phases Fe2As and Co2As form other crystal structures. The crystal structure of (Fe1-xCox)2 As, 0.35<x<0.9 has a hexagonal unit cell with the metal atoms situated on two different 3-fold positions, one surrounded by four non-metal atoms in a tetrahedral environment and one by five non-metal atoms in a square pyramidal coordination. The cobalt atoms are preferentially occupying the tetrahedral position and the iron atoms the pyramidal site. The two compositions (Fe0.6Co0.4)2As and (Fe0.4Co0.6)2As are ferromagnetic with TC 320K and 260K respectively. For x=0.4 the magnetic moment are directed along the c-axis, and for x=0.6 in the ab-plane. The saturation magnetization corresponds to 2.4 µB/f.u. (x=0.4) and 1.7 µB/f.u. (x=0.6). The total magnetic moments on the tetrahedral site are very small (0.1 and 0.0 µB/f.u.) and the moments on the cobalt atoms vanish. The aim of the present proposal is to experimentally investigate the dependence of the magnetic short range order correlated to the nuclear short range order.
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SAHLBERG Martin; ANDERSSON Yvonne; BRANDT ANDERSSON Yvonne; DELCZEG Erna; ERIKSSON Olle; HOGLIN Viktor; HUDL Matthias; NORDBLAD Per and WILDES Andrew. (2012). The magnetic interactions between iron and cobalt in the ternary iron arsenide, (Fe1-x Cox)2As, above the Curie temperature. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-32-773
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