Abstract
We study the critical behaviour of the B-spinel ZnxCd1-xCr2S4 systems in the concentration range 0.2 ≤ x ≤ 0.5. Using the ferromagnetic spin-wave theory at low temperature, and the molecular field approximation, the exchange integrals were calculated up to third nearest neighbours. The critical region is studied by high-temperature series expansion extrapolated with the Padé Approximants method. The critical temperatures Tc and the critical exponents associated with the magnetic susceptibility γ and the correlation length ν are estimated. Tc obtained are in good agreement with those obtained by magnetic measurements. The values of γ and ν are sensitive to the dilution x.
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