IMPACT OF LA SUBSTITUTION ON THE MAGNETIC STRUCTURE OF A LOW-CARRIER-DENSITY KONDO SYSTEM : CE0.9LA0.1P

We have performed neutron-diffraction measurements on ${\mathrm{Ce}}_{0.9}{\mathrm{La}}_{0.1}\mathrm{P}$ under high pressure. The La-substituted ${\mathrm{Ce}}_{0.9}{\mathrm{La}}_{0.1}\mathrm{P}$ system exhibits a $P\ensuremath{-}T$ magnetic phase diagram very similar to that of the parent compound CeP. The large local randomness on the Ce lattice, however, introduces drastic changes in the magnetic structure of the La-substituted system.