Absence of hysteresis in the heat capacity of the three-dimensional random-field Ising model

TL;DR

This study investigates the heat capacity of the 3D random-field Ising model compound Fe0.58Zn0.42F2, finding no hysteresis between field-cooling and zero-field-cooling procedures, which suggests specific phase diagram characteristics.

Contribution

The paper provides experimental evidence of the absence of hysteresis in heat capacity measurements, offering insights into the phase diagram of the 3D random-field Ising model.

Findings

No hysteresis observed between FC and ZFC protocols.

Metastability region identified in the H-T phase diagram.

Supports theoretical predictions about phase behavior.

Abstract

Heat capacity measurements on the prototypical three-dimensional random-field Ising model compound Fe0.58Zn0.42F2 have been performed in both of the field-cooling (FC) and zero-field-cooling (ZFC) procedures. There is no evidence of hysteresis between the FC and ZFC protocols within the experimental accuracy. The absence of hysteresis is interpreted based on a magnetic field (H)-temperature (T) phase diagram in which a metastability region exists between the Neel temperature line Tn(H) and Hc1(T), the latter being the lowest critical field line for the local spin flips.