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Among heavy-fermion metals, Ce$_3$Pd$_{20}$Si$_6$ is one of theheaviest-electron systems known to date. Here we used high-resolution neutronspectroscopy to observe low-energy magnetic scattering from a single crystal ofthis compound in the paramagnetic state. We investigated its temperaturedependence and distribution in momentum space, which was not accessible inearlier measurements on polycrystalline samples. At low temperatures, aquasielastic magnetic response with a half-width {\Gamma}=0.1 meV persists withvarying intensity all over the Brillouin zone. It forms a broad hump centeredat the (111) scattering vector, surrounded by minima of intensity at (002),(220) and equivalent wave vectors. The momentum-space structure distinguishesthis signal from a simple crystal-field excitation at 0.31 meV, suggestedpreviously, and rather lets us ascribe it to short-range dynamical correlationsbetween the neighboring Ce ions, mediated by the itinerant heavy f-electronsvia the RKKY mechanism. With increasing temperature, the energy width of thesignal follows the conventional T$\scriptstyle^{1/2}$ law, {\Gamma}(T) ={\Gamma}$_0$ + A*T$\scriptstyle^{1/2}$. The momentum-space symmetry of thequasielastic response suggests that it stems from the simple-cubic Cesublattice occupying the 8c Wyckoff site, whereas the crystallographicallyinequivalent 4a site remains magnetically silent in this material.

Momentum-space structure of quasielastic spin fluctuations in Ce3Pd20Si6