Abstract
We study the magnetic properties and the critical behaviour of the B-spinel CdCr2xIn2—2xS4 systems in the range of concentration 0.9 ≤ x ≤ 1. Using the mean-field theory combined with the probability distribution of interaction, the exchange integrals were calculated up to the second nearest neighbours. The critical temperature and the critical exponents for the magnetic sysceptibility and the correlation length γ and ν, respectively, are deduced by applying the high-temperature series expansion (HTS) extrapolated with the Pade approximants (PA) method. The obtained values of Tc are in good agreement with those predicted by the magnetic measurements. The values of γ and ν are sensitive to the dilution ratio x. For the compounds situated in the region 0.98 ≤ x ≤ 1, they are close to those of the 3D Heisenberg model. For the concentration x = 0.9, γ and ν deviate slowly from the values predicted by this model and approach the values found in re-entrant systems.
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