Ferromagnetic Properties of ZrZn₂

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The low Curie temperature (TC approx 28K) and small ordered moment (M₀ approx 0.17 muB f.u.-1) of ZrZn2 make it one of the few examples of a weak itinerant ferromagnet. We report results of susceptibility, magnetization, resistivity and specific heat measurements made on high-quality single crystals of ZrZn2. From magnetization scaling in the vicinity of TC (0.001<|T-TC|/TC<0.08), we obtain the critical exponents beta=0.52+/-0.05 and delta=3.20+/-0.08, and TC=27.50+/-0.05K. Low-temperature magnetization measurements show that the easy axis is [111]. Resistivity measurements reveal an anomaly at TC and a non-Fermi liquid temperature dependence rho(T)=rho₀+ATⁿ, where n=1.67+/-0.02, for 1<T<14K. The specific heat measurements show a mean-field-like anomaly at TC. We compare our results to various theoretical models.