The non-linear paramagnetic effect in CdCr2Se4 near the Curie temperature

Results are presented of measurements made of alternating current susceptibility changes Δχ = χ_B - χ₀ induced by external application of a constant magnetic field using the beat method (f ～ 1MHz). For 1 K < (T ? T_c) < 50 K and taking the appropriate values of magnetic fields the relation Δχ ～ B² was satisfied. Making use of the Debye theory adapted for the non-linear dielectric effect, it was shown that the mean number n of elementary cells in a cluster varies with temperature according to the relation n ～ (T ? T_c)^-1.31.