Abstract
The ternary copper indides RE 2CuIn 3≡ RECu 0.5In 1.5 ( RE=Ce, Pr, Nd, Sm and Gd) were synthesized from the elements in sealed tantalum tubes in an induction furnace. They crystallize with the CaIn 2-type structure, space group P6 3/ mmc, with a statistical occupancy of copper and indium on the tetrahedral substructure. These indides show homogeneity ranges RECu x In 2− x . Single crystal structure refinements were performed for five crystals: CeCu 0.66In 1.34 ( a=479.90(7) pm, c=768.12(15) pm), PrCu 0.52In 1.48 ( a=480.23(7) pm, c=759.23(15) pm), NdCu 0.53In 1.47 ( a=477.51(7) pm, c=756.37(15) pm), SmCu 0.46In 1.54 ( a=475.31(7) pm, c=744.77(15) pm), and GdCu 0.33In 1.67 ( a=474.19(7), c=737.67(15) pm). Temperature-dependent susceptibility measurements show antiferromagnetic ordering at T N=4.7 K for Pr 2CuIn 3 and Nd 2CuIn 3 and 15 K for Sm 2CuIn 3. Fitting of the susceptibility data of the samarium compound revealed an energy gap Δ E=39.7(7) K between the ground and the first excited levels.
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