Influence of spin fluctuations on the electrical resistance ofUAl2andUPt3at high pressures and low temperatures

The compounds ${\mathrm{UAl}}_2$ and ${\mathrm{UPt}}_3$ are thought to exhibit ferromagnetic spin fluctuations. We have measured the electrical resistance of both materials to over 1000 K at zero pressure and from room temperature to 1 K at pressures up to 18 kbar. The primary effect of pressure is to reduce the lowtemperature slope $\frac{\partial R}{\partial T}$ and thus shift the inflection point in the resistance to higher temperatures. We interpret these observations as arising from an increase in the spin-fluctuation temperature $T_s$ with increasing pressure. Using a Fermi-liquid description of these materials, we calculate the pressure dependence of the $T=0\mathrm{}$ susceptibility from the pressure dependence of $T_s$. We also find that the temperature-dependent resistance at various fixed pressures scales as $\frac{T}{T_s\mathrm{}\left(P\right)\mathrm{}}$ over a remarkably large temperature interval.