Ground state properties of the Y bCu5−xAux(0<x≤ 1.8) solid solution

Samples prepared across the YbCu 5-x Au x solid solution system remain cubic AuBe 5 -type up to x = 1.8. As the Au concentration x is increased, the Au atoms first replace the Cu atoms on the 4c sites of the F43m space group until the sites are fully occupied, and then replace atoms on the 16e sites until the structure becomes unstable. The composition at x = 1 is at the crossover between two kinds of disordered sublattices and the ground state properties follow a non-monotonic behaviour through x = 1.