Abstract
A series of new rare-earth indium−germanides RE2InGe2 (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 Mo2FeB2 family (an ordered ternary variant of the U3Si2 structure type). The temperature dependence of the dc magnetization (5−300 K) indicates that the RE2InGe2 (RE = Sm−Ho) compounds order magnetically below ca. 60 K, whereas Yb2InGe2 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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