Absence of lattice coherence effects in Ce0.6La0.4Pb3: A magnetic field study

TL;DR

This study investigates the specific heat of Ce0.6La0.4Pb3 under magnetic fields and finds that lattice coherence effects are negligible, with the behavior well explained by a single-impurity Kondo model.

Contribution

The paper demonstrates that lattice coherence effects are absent in the magnetic response of Ce0.6La0.4Pb3, contrasting with expectations for concentrated Kondo systems.

Findings

Specific heat data fits the single-impurity Kondo model

Lattice coherence effects are not significant in magnetic response

Magnetic field response is well described by a single parameter

Abstract

The specific heat of polycrystalline Ce0.6La0.4Pb3 has been measured in magnetic fields ranging from 0 to 14 T. After subtraction of a lattice contribution, the specific heat between 1 K and 10 K is well described by the S=1/2 single-impurity Kondo model with just one adjustable parameter: the zero-field Kondo temperature. In particular, the variation in the temperature and the height of the peak in C vs T is captured with good accuracy. This fit suggests that lattice coherence effects play no significant role in the magnetic-field response of this concentrated Kondo system.