Study on the critical behavior and magnetocaloric effect of RCrO3 (R = Gd, Dy)

In this study, we aim to examine the critical behavior and magnetocaloric effect of RCrO3 (R = Gd, Dy) polycrystal synthesized by solid-state sintering. As per the heat capacity fitting curves, GdCrO3 and DyCrO3 fit the 3DXY and 3D-Ising models, respectively. The analysis of heat capacity curves, field cooling (FC), and zero-field cooling (ZFC) curves reveals two magnetic phase transitions in the samples, with TNCr = 174 K, TNGd = 3.7 K and TNCr = 152 K, TNDy = 3.5 K for GdCrO3 and DyCrO3, respectively. Under a 50 kOe magnetic field, the maximum magnetic entropy change (- Delta Smmax) and relative cooling efficiency (RCP) of the sample are 39.9 J/kg K, 373.4 J/ kg and 15.9 J/kg K, 276 J/kg for the two samples, respectively. We believe that the significant magnetocaloric effect of GdCrO3 is associated with its critical behavior. This provides an additional reference for the origin of the large magnetocaloric effect of materials.

Automated summary

In this study, we investigated the critical behavior and magnetocaloric effect of RCrO3 (R = Gd, Dy) polycrystals synthesized by solid-state sintering. The heat capacity fitting curves showed that GdCrO3 and DyCrO3 followed the 3DXY and 3D-Ising models, respectively. Analysis of heat capacity curves, field cooling and zero-field cooling curves revealed two magnetic phase transitions in the samples, with specific transition temperatures for each material. The maximum magnetic entropy change and relative cooling efficiency under a 50 kOe magnetic field were also measured for both samples.