Fermi-surface topology of the heavy-fermion system Ce 2 PtIn 8

${\mathrm{Ce}}_{2}{\mathrm{PtIn}}_{8}$ is a recently discovered heavy-fermion system structurally related to the well-studied superconductor ${\mathrm{CeCoIn}}_{5}$. Here we report on low-temperature de Haas--van Alphen-effect measurements in high magnetic fields in ${\mathrm{Ce}}_{2}{\mathrm{PtIn}}_{8}$ and ${\mathrm{Pr}}_{2}{\mathrm{PtIn}}_{8}$. In addition, we performed band-structure calculations for localized and itinerant Ce-$4f$ electrons in ${\mathrm{Ce}}_{2}{\mathrm{PtIn}}_{8}$. Comparison with the experimental data of ${\mathrm{Ce}}_{2}{\mathrm{PtIn}}_{8}$ and of the $4f$-localized ${\mathrm{Pr}}_{2}{\mathrm{PtIn}}_{8}$ suggests the itinerant character of the Ce-$4f$ electrons. This conclusion is further supported by the observation of effective masses in ${\mathrm{Ce}}_{2}{\mathrm{PtIn}}_{8}$, which are strongly enhanced with up to 26 bare electron masses.