Evidence for a common physical description of non-Fermi-liquid behavior in f-electron systems

TL;DR

This paper demonstrates that non-Fermi-liquid behavior in various f-electron systems can be explained by a unified theory based on Griffiths singularities, supported by specific heat and susceptibility measurements.

Contribution

It provides experimental evidence that diverse f-electron systems exhibit NFL behavior consistent with a common Griffiths singularity-based theoretical framework.

Findings

C(T)/T and χ(T) follow T^{-1+λ} dependence in studied systems

Results support a universal physical description of NFL behavior

Data aligns with predictions of the Griffiths singularities model

Abstract

The non-Fermi-liquid (NFL) behavior observed in the low temperature specific heat $C(T)$ and magnetic susceptibility $\chi(T)$ of f-electron systems is analyzed within the context of a recently developed theory based on Griffiths singularities. Measurements of $C(T)$ and $\chi(T)$ in the systems $Th_{1-x}U_{x}Pd_{2}Al_{3}$, $Y_{1-x}U_{x}Pd_3$, and $UCu_{5-x}M_{x}$ (M = Pd, Pt) are found to be consistent with $C(T)/T \propto \chi(T) \propto T^{-1+\lambda}$ predicted by this model with $\lambda <1$ in the NFL regime. These results suggest that the NFL properties observed in a wide variety of f-electron systems can be described within the context of a common physical picture.