Spin-glass behaviour of A-In2-2xCr2xS4 (A: Fe,Ni) spinel compounds

In the system A-In_2–2xCr_2xS₄ (A: Fe,Ni) a series of solid solutions of general formula FeIn_2–2xCr_2xS₄ and NiIn_2–2xCr_2xS₄ were grown from the vapor phase by chemical transport technique.

Spin-glass behaviour has been observed in both FeIn_2–2xCr_2xS₄ and NiIn_2–2xCr_2xS₄ spinel systems for 0 ≤ x ≤ 0.5. However no evidence of magnetic order down to 1.8 K was found for NiIn₂S₄ single crystals. The In substitution leads to more disordered magnetic system, spin-glass and reentrant-like properties.