Griffiths phase, magnetic memory and ac susceptibility of an antiferromagnetic titanate-based perovskite Er_0.9Sr_0.1Ti_0.975Cr_0.025O₃ system

In this study, we investigated different physical properties of Er_0.9Sr_0.1Ti_0.975Cr_0.025O₃ titanate prepared by a solid-state reaction that produces a cubic structure with Fd-3m (227) as a space group. Zero-Field Cooled and Field Cooled measurements show a second-order antiferromagnetic transition at Neel temperature T_N = 23 K, and the existence of Griffiths phase at around T_GP = 132 K. This soft magnetic material depicts a magnetic memory since it 'remembers' its thermal history. The relative cooling power of this titanate-based sample was then measured to be around 292.27 J kg^-1 at 5 Tesla and 400 J kg^-1 at 6 Tesla. However, these values are lower than the RCP value reported for the most magnetic refrigerant Gd, although these results are high enough compared to different perovskite systems. Therefore, Er_0.9Sr_0.1Ti_0.975Cr_0.025O₃ is a very suitable, environment-friendly magnetic refrigerant.