Kondo Scaling in the Optical Response of YbIn_(1-x)Ag_xCu_4

TL;DR

This study investigates how the optical response of YbIn_(1-x)Ag_xCu_4 varies with the Kondo temperature, revealing universal scaling behavior predicted by theory through infrared measurements.

Contribution

It provides experimental evidence of Kondo scaling in the optical response of a correlated electron system, linking optical features to the Kondo temperature and hybridization effects.

Findings

Optical excitation features vary systematically with Kondo temperature.

Experimental results align with theoretical predictions of universality in Kondo systems.

The study offers a framework for understanding local-moment and conduction electron hybridization effects.

Abstract

Theoretical work on Kondo systems predicts universality in the scaling of observable quantities with the Kondo temperature, T_K. Here we report infrared-frequency optical response measurements of the correlated system \ybinag. We observe that x-dependent variations in the frequency and strength of a low energy excitation are related to the x-dependent Kondo temperature. Comparison of the inferred trends with existing theory and a model calculation provides a framework in which to view these experimental results as scaling phenomena arising from local-moment/conduction electron hybridization.