Robustness of non-Fermi-liquid behavior near the ferromagnetic critical point in clean ZrZn2

Electrical resistivity rho of a weak itinerant ferromagnet ZrZn2 with a low residual resistivity rho(0) similar or equal to 0.46 mu Omega cm was measured under hydrostatic pressure P up to 3.2 GPa. T-2-behavior of rho, a hallmark of Fermi liquid, was not observed down to 1 K not only at around the ferromagnetic critical point P-c similar to 2 GPa but over an entire pressure range investigated. The temperature dependence of rho at low temperatures evolved from T-5/3 in the ferromagnetic phase to T-3/2 in the paramagnetic phase. This change, however, was very weak and it was hard to capture the signature of critical point in the resistivity. Such a breakdown of Fermi liquid over a remarkably wide phase space indicates the lack of some ingredient in the description of magnetic quantum critical point in clean metals.