Abstract
The critical behaviour of the ferro-paramagnetic phase transformation has been analysed in the weak itinerant-electron ferromagnet, ZrZn 2. The critical exponents β, γ and γ′ describe the temperature dependence of the spontaneous polarization J S and the inverse zero-field susceptibility χ -1, whereas the exponent δ determines the field dependence of the polarization at the Curie temperature, T C. To complete the description of the critical behaviour the reduced critical amplitudes J 0/ J S(0), μ h 0/( k B T C) and DJ δ 0/ h 0 were also determined. The exponent values obtained are in good agreement with the theoretical prediction of the mean field theory, which should be valid in the case of magnetic long-range interactions. In the case of the critical amplitudes, the values cannot be correlated to a particular model.
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