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The intermetallic compounds RE 2 Au 2 Sn (RE = Y, Dy-Tm, Lu) and RE 2 Au 2 In (RE = Ho, Lu) were synthesized from the elements via arc-melting and subsequent annealing at 1070 K for 10 days. Depending on the size of the rare earth element, the compounds crystallize with the Mo 2 B 2 Fetype (space group P4/mbm) or the Er 2 Au 2 Sn structure (space group P42/mnm), a superstructure of Mo 2 B 2 Fe. Temperature dependent susceptibility measurements of Y 2 Au 2 Sn, Lu 2 Au 2 Sn, and Lu 2 Au 2 In indicate Pauli paramagnetism compatible with the metallic behavior deduced from resistivity measurements. Ho 2 Au 2 In and RE 2 Au 2 Sn (RE = Dy-Tm) show Curie-Weiss behavior above 50 K with experimental magnetic moments close to the free ion values of the trivalent rare earth elements. The compounds Ho 2 Au 2 In, Dy 2 Au 2 Sn, Ho 2 Au 2 Sn, and Er 2 Au 2 Sn, undergo magnetic ordering at 20(1) (F), 16(1) (AF), 8(1) (AF), and 4.5(1) K (AF), respectively. Tm 2 Au 2 Sn remains paramagnetic down to 2 K.

Magnetic and Electrical Properties of the Intermetallic Compounds RE 2 Au 2 Sn (RE = Y, Dy–Tm, Lu) and RE 2 Au 2 In (RE = Ho, Lu)