A series of new rare-earth indium-germanides RE 2 InGe 2 (RE ) Sm, Gd, Tb, Dy, Ho, Yb) have been prepared from the corresponding elements through high-temperature reactions using an excess of indium as flux. Single-crystal and powder X-ray diffraction studies showed that these ternary phases crystallize in the tetragonal space group P4/mbm, Z ) 2, Pearson's symbol tP10, and represent new members of the Mo 2 FeB 2 family (an ordered ternary variant of the U 3 Si 2 structure type). The temperature dependence of the dc magnetization (5-300 K) indicates that the RE 2 InGe 2 (RE ) Sm-Ho) compounds order magnetically below ca. 60 K, whereas Yb 2 InGe 2 exhibits Pauli-like temperature-independent paramagnetism. Isothermal magnetization, electrical resistivity, and calorimetry measurements are presented as well and confirm the existence of ordered antiferromagnetic states at low temperatures. The structural trends and the evolution of the magnetic properties are also discussed.
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