Abstract
In the present study, we have investigated the detailed magnetic and magnetocaloric properties of the rare-earth-based polycrystalline BiGdO3 compound, synthesized by the solid-state reaction method. Detailed magnetic measurements show the absence of long-range magnetic ordering down-to 2 K. Zero-field heat capacity study also supports this result. However, all these magnetic and heat capacity measurements reveal the possibility of having a weak short-range antiferromagnetic correlation in this system below 40 K. Detailed analysis of the magnetic isotherms (using modified Langevin function) and field-dependent magnetic entropy change (using mean-field theory) nicely represent the existence of short-range antiferromagnetic correlation in this system. The prepared material also exhibits a large magnetic entropy change of about 25 J kg−1 K−1 at 2.6 K and a large adiabatic temperature change of 14.8 K at 12 K for the magnetic field change of 0–70 kOe. This observed large magnetocaloric effect at this low temperature region is possibly a consequence of the absence of long-range magnetic ordering and the presence of field-induced ferromagnetic behaviour in this BiGdO3 compound.
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