Four different samples of the solid solution CeAuIn1−xMgx 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 F2 values, 15 variables for CeAuIn0.871Mg0.129, a = 775.25(7), c = 419.36(10) pm, wR2 = 0.0488, BASF = 0.10(1), 397 F2 values, 16 variables for CeAuIn0.640Mg0.360, a = 774.62(7), c = 420.13(10) pm, wR2 = 0.0435, 376 F2 values, 15 variables for CeAuIn0.445Mg0.555, a = 773.80(11), c = 420.82(8) pm, wR2 = 0.0415, 392 F2 values, 15 variables for CeAuIn0.228Mg0.772. 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 (CeAuIn0.871Mg0.129) to 328.3 (CeAuIn0.228Mg0.772) 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 CeAuIn1−xMgx 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.
Phase Diagram of Pyrochlore Iridates: All-in–All-out Magnetic Ordering and Non-Fermi-Liquid Properties
