# Electronic structure and 4f-electron character in Ce2PdIn8 studied by angle-resolved photoemission spectroscopy

## TL;DR

This study investigates the electronic structure of Ce2PdIn8, revealing a high-temperature localized-to-itinerant transition of Ce 4f electrons around 120K using advanced photoemission techniques.

## Contribution

First direct observation of the localized-to-itinerant transition of Ce 4f electrons in Ce2PdIn8 over a wide temperature range.

## Key findings

- Hybridization forms a Kondo resonance near the Fermi level at low temperatures.
- The transition temperature is around 120K, higher than the coherence temperature.
- Electronic structure characterized by high-resolution photoemission spectroscopy.

## Abstract

The localized-to-itinerant transition of f electrons lies at the heart of heavy-fermion physics, but has only been directly observed in single-layer Ce-based materials. Here, we report a comprehensive study on the electronic structure and nature of the Ce 4f electrons in the heavy-fermion superconductor Ce2PdIn8, a typical n=2 CenMmIn3n+2m compound, using high-resolution and 4d-4f resonance photoemission spectroscopies. The electronic structure of this material has been studied over a wide temperature range, and hybridization between f and conduction electrons can be clearly observed to form a Kondo resonance near the Fermi level at low temperatures. The characteristic temperature of the localized-to-itinerant transition is around 120K, which is much higher than its coherence temperature Tcoh~30K.