Abstract
A new ternary compound with stoichiometry U 2Co 3Al 9 has been synthesized. It adopts the orthorhombic Y 2Co 3Ga 9-type structure (space group Cmcm, Z = 4, a = 12.824(2) Å, b = 7.515(1) Å, c = 9.249(2) Å). Measurements of dc- and ac-magnetic susceptibility, electrical resistivity, and magnetoresistivity on polycrystalline samples have been performed. The Curie–Weiss law is strictly followed, with θ CW = −48 K and μ eff = 3.2 μ B. A small kink observed in the temperature dependence of the resistivity is attributed to a phase transition at T t = 8 K. The magnetoresistivity was found to be negative at all temperatures examined below 45 K, with a sharp minimum at T t = 8 K.
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