Experimental Evidence for the Griffiths Phase in Disordered Strongly Correlated Electron Systems: Examples

This report contributes to the ongoing discussion on the role of structural disorder and its impact on the physical properties of strongly correlated electron systems (SCESs). It has been theoretically predicted that, in the quantum critical regime, disorder arising from structural defects or doping can significantly influence the nature of the quantum macrostate in these materials. Disorder-driven mechanisms have also been proposed to explain the non-Fermi-liquid (NFL) behavior observed in such structurally disordered systems. The most prominent among these are the Kondo disorder scenario and an alternative model based on the Griffiths phase (GP). In this review, we extend these theoretical considerations through experimental investigations, providing empirical evidence for the existence of the GP state and/or Griffiths singularities in selected SCESs. Specifically, we examine the manifestation of the GP in CeRhSn with documented atomic disorder, Fe-doped Ce\ (₃\) Co\ (₄\) Sn\ (₁₃\) (Remeika phase), and selected Fe-based Heusler alloys. Abstract Published by the Jagiellonian University 2026 authors