Magnetic properties of Cd1–xFexCr2S4 (x = 0.5–0.8) solid solutions

Cd 1– x Fe x Cr 2 S 4 ( x = 0.5–0.8) spinel solid solutions have been synthesized and their magnetic properties have been measured using a Quantum Design PMS-9 instrument at temperatures from 5 to 300 K in a static (7960 A/m) and an ac (100, 1000, and 10000 Hz) magnetic field (79.6 A/m peak) at an external field H = 0. At low temperatures, all of the solid solutions have extended ranges where their dynamic magnetic susceptibility around their ferrimagnetic transition is frequency-dependent. The obtained results are discussed in terms of models that take into account the instability of the long-range magnetic order in the endmembers of the solid solution system: FeCr 2 S 4 and CdCr 2 S 4 .