Influence of Ti Substitution on the Critical Properties of CuxCryTizSe4 (z = 0.24 and 0.35)
Magnetization, M, and susceptibility, , measurements of CuxCryTizSe4 (z = 0.24 and 0.35) showed both strong lowering of magnetic moment in comparison with CuCr2Se4 matrix and zero-field-cooling (ZFC) – field-cooling (FC) susceptibility splitting characteristic for the spin-glass (SG) behaviour. Isothermal magnetization curves, M(H), easy saturate and large both the Curie (TC ~ 250 K) and Curie-Weiss (θCW ~ 280 K) temperatures indicate the ferromagnetic order which coexists with the SG state. The critical behaviour of polycrystalline CuxCryTizSe4 spinels investigated around the paramagnetic–ferromagnetic (PM-FM) phase transition revealed that the values of critical exponents are close to those predicted by the mean field model for long-range interactions only for Cu1.02Cr1.77Ti0.24Se4. It means that the larger spin frustration the more difficulty is it to describe the critical properties with the aid of the theoretical models.
Yuriy Verbovytskyy and António Pereira Gonçalves
J. Krok-Kowalski et al., "Influence of Ti Substitution on the Critical Properties of CuxCryTizSe4 (z = 0.24 and 0.35)", Solid State Phenomena, Vol. 194, pp. 144-147, 2013