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Despite more than half a century of studies in heavy-fermion compounds, afull understanding of the various possible magnetic ordering phenomena is stillfar from complete. Some heavy-fermion materials show so-called hidden-orderphases, which are invisible to conventional diffraction techniques. Themultipolar moments of the $f$-electrons in their specific crystal fieldenvironment play a decisive role in the formation of these phases. Suchhidden-order phases have been observed in a variety of compounds containing$4f$ and $5f$ elements, like URu$_2$Si$_2$, NpO$_2$, YbRu$_2$Ge$_2$, andCeB$_6$. The competition or coexistence of multipolar ordering with moreconventional magnetic order parameters, such as ferro- or antiferromagnetism,gives rise to complex magnetic-field$-$temperature phase diagrams in thesecompounds that provide a rich playground for experimental and theoreticalinvestigations. Here I examine the pure and La-doped $f$-electron systemCeB$_6$, as well as Ce$_{3}$Pd$_{20}$Si$_{6}$, by means of neutron scattering.The magnetic field dependence of the zone center exciton mode in CeB$_6$ wasstudied in fields up to 14.5 T and compared with the existing theory. A longstanding question of the applicability of the phenomenological temperaturedependence $\Gamma=k_{\text B}T_{\text K}+A \sqrt{T}$, where $T_{\text K}$ isthe Kondo temperature, for two limiting cases, the Kondo lattice and Kondoimpurity, has been investigated on a set of samples diluted with lanthanum. InCe$_{3}$Pd$_{20}$Si$_{6}$, the order parameter of the AFQ phase was uncovered,and its field dependence was studied in fields up to 9 T.

Magnetic Dynamics in Heavy-Fermion Systems with Multipolar Ordering Studied by Neutron Scattering