Unraveling the origin of the Griffiths phase in Ho₂NiMnO₆: Perspectives from linear and nonlinear AC susceptibility

In this study, we investigated the magnetic ordering and underlying mechanism of the Griffiths phase, observed in Ho 2 NiMnO 6 through AC susceptibility measurements. Our results indicate that the transition around 86 K corresponds to a paramagnetic to ferromagnetic transition characterized by classical magnetic ordering. Notably, nonlinear AC susceptibility measurements revealed the existence of ferromagnetic clusters within a paramagnetic background well above the transition temperature, establishing this as the origin of the Griffiths-like phase within the Ni/Mn sublattice of Ho 2 NiMnO 6 . Our study on the Ho 2 NiMnO 6 system provides insight into the intricate magnetic phenomena common to various other strongly correlated electron systems.