High magnetic field study of sulphur spinel Cu1/2In1/2Cr2S4

High magnetic field measurements indicate that a first order transition occurs in Cu_1/2In_1/2Cr₂S₄ atT<35 K along aH_c(T) line in a (H, T) phase diagram. This confirms previous calorimetric and neutron diffraction experiments. It is suggested that this set of experimental results may be explained by a transition from long range to spin-glass magnetic ordering related to the frustration existing on the underlying fcc Bravais lattice obtained by grouping four by four ferromagnetically coupled spins on top of a tetrahedron.