Griffiths phase, magnetic memory and ac susceptibility of an antiferromagnetic titanate-based perovskite Er0.9Sr0.1Ti0.975Cr0.025O3 system

abstract

In this study, we investigated different physical properties of Er0.9Sr0.1Ti0.975Cr0.025O3 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, Er0.9Sr0.1Ti0.975Cr0.025O3 is a very suitable, environment-friendly magnetic refrigerant.

keywords

MAGNETOCALORIC PROPERTIES; MANGANITE; TEMPERATURE; RELAXATION; BEHAVIOR; MAGNETORESISTANCE; TRANSITION; SRTIO3

subject category

Physics

authors

Hamdi, R; Smari, M; Bajorek, A; Bessais, L; Dhahri, E; Samara, A; Mansour, SA; Haik, Y

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