  The low Curie temperature (T_C approx 28K) and small ordered moment (M_0
approx 0.17 mu_B 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 T_C
(0.001<|T-T_C|/T_C<0.08), we obtain the critical exponents beta=0.52+/-0.05 and
delta=3.20+/-0.08, and T_C=27.50+/-0.05K. Low-temperature magnetization
measurements show that the easy axis is [111]. Resistivity measurements reveal
an anomaly at T_C and a non-Fermi liquid temperature dependence
rho(T)=rho_0+AT^n, where n=1.67+/-0.02, for 1<T<14K. The specific heat
measurements show a mean-field-like anomaly at T_C. We compare our results to
various theoretical models.
