Optical spectroscopy and ultrafast pump-probe studies on the heavy fermion compound CePt$_2$In$_7$

TL;DR

This study uses optical spectroscopy and ultrafast pump-probe techniques to investigate the hybridization and Kondo interactions in the antiferromagnetic heavy fermion compound CePt$_2$In$_7$, revealing weaker hybridization compared to superconducting relatives.

Contribution

It provides the first detailed optical and ultrafast spectroscopic analysis of CePt$_2$In$_7$, highlighting its weaker hybridization strength relative to other heavy fermion compounds.

Findings

Hybridization spectral features are observed at low temperatures.

Hybridization strength is weaker than in superconducting counterparts.

Kondo interactions are present but less pronounced.

Abstract

We report optical spectroscopy and ultrafast pump-probe measurements on the antiferromagnetic heavy fermion compound CePt$_2$In$_7$, a member showing stronger two dimensionality than other compounds in CeIn$_3$-derived heavy-fermion family. We identify clear and typical hybridization spectral structures at low temperature from the two different spectroscopy probes. However, the strength and related energy scale of the hybridization are much weaker and smaller than that in the superconducting compounds CeCoIn$_5$ and CeIrIn$_5$. The features are more similar to observations on the antiferromagnetic compounds CeIn$_3$ and CeRhIn$_5$ in the same family. The results clearly indicate that the Kondo interaction and hybridizations exist in the antiferromagnetic compounds but with weaker strength.