Abstract
Weak itinerant ferromagnetism in YCo 9 Si 4 below about 25 K is studied by means of magnetisation, specific heat, and resistivity measurements. Single-crystal X-ray refinements at room temperature reveal a fully ordered distribution of Y, Co and Si atoms within the tetragonal space group I4/mcm isostructural with LaCo 9 Si 4 . The latter exhibits itinerant electron metamagnetism with an induced moment of about 1 μ B / f . u . above 6 T, whereas YCo 9Si 4 exhibits a spontaneous magnetisation M 0 ≃ 12 Am 2 / kg at 2 K which corresponds to an ordered moment of about 1.6 μ B / f . u . indicating weak itinerant ferromagnetism.
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