Abstract
Using a SQUID magnetometer the magnetization of the Ising ferromagnet dysprosium ethyl sulphate has been measured in the temperature range 0.015–3K and in external fields 0.004–30 Oe. The results atT≳0.4 K (precritical regime) confirm the pure dipolar nature of the magnetic interactions. Particular interest has been paid to the immediate neighbourhood of the critical pointTc=118.17 mK andH=0 where the zero-field susceptibilityχ(T) aboveTc, the spontaneous magnetizationMs(T), and the magnetization atTc,Mc(H), can be described by mean field laws modified by logarithmic singularities. The critical amplitudesΓ, B, andD ofχ, Ms andMc, respectively, satisfy the relation (2/3Γ⋅B2)1/3=D. All these results agree with predictions of (i) the Larkin-Khmel'nitskii theory and (ii) exact solutions of the renormalization group equations for 3-dimensional dipolar Ising ferromagnets.
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