Abstract
Measurements of magnetization were performed on polycrystalline samples of Sm 1- x T x Pd 3 S 4 and Tb 1- x T x Pd 3 S 4 (T = Y and Gd) to examine the origin of first-order-like antiferromagnetic (AFM) transition in SmPd 3 S 4 and TbPd 3 S 4 . With increasing Y (Gd) concentration, the AFM transition temperatures for both Sm 1- x T x Pd 3 S 4 and Tb 1- x T x Pd 3 S 4 decrease (increases) monotonically. First-order AFM transitions observed in SmPd 3 S 4 and TbPd 3 S 4 change into second-order ones by Gd substitution. Such a change in the order of transition implies that a contribution of magnetic interaction to the AFM transition overcomes that of multipolar interaction in Gd-rich compounds.
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