Abstract
Structures and physical properties have been investigated for a series of new ternary sulfides (RES) xTaS 2 (RE=Pr, Sm, Nd, Gd, Dy and Er) with an incommensurate RES-TaS 2 stacking structure. The lattice constants decrease monotonically with increasing the atomic number of rare earths, indicating that RE is trivalent in these compounds. An antiferromagnetic transition is found in (GdS) 1.20TaS 2 and (DyS) 1.22TaS 2 with Néel temperatures of 4.1 and 1.7K, respectively, which are strongly depressed in comparison with those of corresponding rare earth monosulfide. (SmS) 1.19 TaS 2 exhibits weak magnetic behavior indicating the divalent state of Sm, though trivalence is expected from the lattice constant.
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