Magnetic Ground State of CePb3

The occurrence of magnetic order in the heavy-fermion system Ce${\mathrm{Pb}}_3$ has been demonstrated by means of neutron scattering. The magnetic structure is antiferromagnetic with a moment modulation in the cubic (001) plane. The magnetic moments are aligned along the [001] axis, parallel to the antiferromagnetism direction. The local character of $4f$ electrons is evidenced by the observation of crystal-field transitions. The characteristics of Ce${\mathrm{Pb}}_3$ are discussed in terms of competition between usual $4f$ properties and Kondo-type couplings.