Observation of a magnetic-field-induced Griffiths phase in three-dimensional Ising random magnet Ni$_{p}$Mg$_{1-p}$(OH)$_{2}$ from absorption of AC magnetic susceptibility

TL;DR

This study provides experimental evidence for a magnetic-field-induced Griffiths phase in a three-dimensional Ising random magnet Ni_{p}Mg_{1-p}(OH)_{2} by analyzing AC magnetic susceptibility absorption.

Contribution

It demonstrates the existence of a Griffiths phase induced by magnetic field in Ni_{p}Mg_{1-p}(OH)_{2} through AC susceptibility measurements across various compositions.

Findings

Broad peak in absorption observed above critical temperature at high magnetic fields

Evidence of Griffiths phase induced by magnetic field in the material

Absorption behavior varies with composition and temperature

Abstract

The nature of the Griffiths phase in three-dimensional Ising random magnet Ni_{p}Mg_{1-p}(OH)_{2} (p = 0.10, 0.25, 0.315, 0.50, 0.80, and 1) is studied from the measurements of absorption (the out-of phase in AC magnetic susceptibility) in the field-cooled (FC) state. The temperature (T) dependence of absorption is measured in the vicinity of the critical temperature [N\'{e}el temperature for p = 0.50, 0.80, 1, and the spin glass transition temperature for p = 0.1, 0.25, 0.315] in the presence of an external magnetic field H. A broad peak is clearly observed for absorption vs T well above the critical temperature at H > 20 kOe. This result gives a piece of evidence for the magnetic-field induced Griffiths phase.