  The electrical resistivity of the magnetically ordered CeCu_5Au has been
investigated under pressure up to 8.5 GPa. In the magnetically ordered region
(p<3.4 GPa) the residual resistivity rho_0 shows a pronounced maximum as a
function of pressure. Even in the nonmagnetic region rho_0 decreases
monotonically by more than a factor of three. These two effects can be
qualitatively explained in terms of the interplay of pressure, magnetism and
disorder in a strongly correlated electron system with weak disorder.
