${\mathrm{Ce}}_2{\mathrm{PtIn}}_8$ 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.

• Received 1 February 2018
• Revised 4 April 2018

DOI:https://doi.org/10.1103/PhysRevB.97.165120