Single-ion Kondo behavior of a novel Kondo lattice, CeNi9Si4

TL;DR

This study investigates the Kondo behavior of CeNi9Si4 and its solid solutions, revealing that Ce exhibits single-ion Kondo behavior despite unusual lattice properties, through magnetic, heat capacity, and resistivity measurements.

Contribution

It demonstrates that Ce in CeNi9Si4 shows single-ion Kondo behavior, contrasting with its unusual lattice characteristics, using comprehensive experimental analysis.

Findings

Ce exhibits single-ion Kondo behavior

Breakdown of Kadowaki-Woods relationship observed

Magnetic susceptibility and heat capacity support single-ion nature

Abstract

The compound, CeNi9Si4 has been recently reported to be an unusual Kondo lattice with a large Ce-Ce separation, with a breakdown of Kadowaki-Woods relationship governing low temperature electrical resistivity and heat-capacity. Here we report the results of magnetic susceptibility, heat-capacity and electrical resistivity of the solid solution, Ce(1-x)La(x)Ni9Si4 to understand the Kondo behavior of this compound. The results establish that the observed properties of Ce in this compound are single-ionic in character.