Comment on "Evidence for a non Fermi liquid phase in Ge-substituted YbRh$_2$Si$_2$"

TL;DR

This paper discusses the implications of a proposed non-Fermi liquid quantum critical phase in Ge-doped YbRh2Si2, analyzing its impact on the understanding of field-induced quantum criticality in heavy-fermion systems.

Contribution

It provides a critical discussion on the consequences of a non-Fermi liquid phase for the standard field-induced quantum critical behavior in YbRh2Si2.

Findings

Highlights the potential existence of a new metallic quantum critical phase.

Explores how this phase affects the interpretation of quantum criticality in heavy-fermion materials.

Suggests revisions to existing theoretical models based on the non-Fermi liquid behavior.

Abstract

In a recent paper, Custers {\it et al.} \cite{custers} argue for the existence of a new metallic quantum critical phase at 0 K in the Ge-doped heavy-fermion system YbRh$_2$Si$_2$ in the presence of magnetic frustration. In here we discuss the consequences of this identification for the (more standard) field induced quantum critical phase.