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Four different samples of the solid solution CeAuIn 1−x Mg x  with x = 0.2, 0.4, 0.6, and 0.8 have been prepared from the elements in sealed tantalum tubes in an induction furnace. The samples were characterized through X-ray powder and single crystal data: ZrNiAl type, P6̅2m, Z = 3, a = 774.54(7), c = 420.32(10) pm, wR2 = 0.0203, 395 F 2  values, 15 variables for CeAuIn 0.871 Mg 0.129 , a = 775.25(7), c = 419.36(10) pm, wR2 = 0.0488, BASF = 0.10(1), 397 F 2  values, 16 variables for CeAuIn 0.640 Mg 0.360 , a = 774.62(7), c = 420.13(10) pm, wR2 = 0.0435, 376 F 2  values, 15 variables for CeAuIn 0.445 Mg 0.555 , a = 773.80(11), c = 420.82(8) pm, wR2 = 0.0415, 392 F 2  values, 15 variables for CeAuIn 0.228 Mg 0.772 . The lattice parameters show no pronounced changes within the solid solution. The largest shift occurs for the x parameter of the mixed occupied In/Mg positions. Due to the difference in size, the trigonal prisms around the Au1 atoms at the origin become smaller with an increasing content of magnesium. The In/Mg-In/Mg distances decrease from 334.5 (CeAuIn 0.871 Mg 0.129 ) to 328.3 (CeAuIn 0.228 Mg 0.772 ) pm, and consequently one observes also shorter bonds to the Au1 atoms with an increasing content of magnesium concentration. Susceptibility measurements reveal trivalent cerium for all CeAuIn 1−x Mg x  compounds, with no evidence sign of magnetic ordering down to 2 K. The disorder created by chemical substitution destroys the longrange magnetic ordering which can be attributed to the triggering of non Fermi-liquid (NFL) like behavior.

The Solid Solution CeAuIn 1–x Mg x – Structure, Magnetic Properties and Specific Heat Data