First Investiation of magnetic ground states in the rare-earth intermetallic compounds RAl₀.₉Si₁.₁ (R = Ce, Pr, Gd)

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We report the magnetic properties strongly varying with the rare-earth elements in the newly found ternary compounds RAl₀.₉Si₁.₁, which crystallize in the tetragonal α-ThSi₂-type structure. For R = Ce the alloy has a weak ferromagnetism below 11 K and for R = Pr it orders ferromagnetically at 17 K, while for R = Gd it is antiferromagnetic with T N = 30.5 K. In addition, we find no field effect on T N of R = Gd because of the large internal mean field, but significant changes in the magnetic properties of R = Ce and Pr.