# Fermi-surface topology of the heavy-fermion system Ce$_{2}$PtIn$_{8}$

## TL;DR

This study investigates the Fermi-surface topology of the heavy-fermion compound Ce$_{2}$PtIn$_{8}$ using quantum oscillation measurements and band-structure calculations, revealing itinerant Ce-$4f$ electrons and large effective masses.

## Contribution

It provides the first detailed Fermi-surface analysis of Ce$_{2}$PtIn$_{8}$, demonstrating the itinerant nature of Ce-$4f$ electrons through experimental and theoretical comparison.

## Key findings

- Ce$_{2}$PtIn$_{8}$ exhibits strongly enhanced effective masses up to 26 times the electron mass.
- The Fermi surface topology suggests itinerant Ce-$4f$ electrons.
- Comparison with Pr$_{2}$PtIn$_{8}$ supports the itinerant electron conclusion.

## Abstract

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