Abstract
Magnetocaloric (MC) properties of GdMnO3 single crystals are investigated using magnetic and magneto-thermal measurements. GdMnO3 exhibits a giant MC effect (isothermal change in magnetic entropy (−ΔSM) ~ 31 J (kg K)−1 at 7 K and adiabatic change in temperature ~10 K at 19 K for magnetic field variation 0–80 kOe). Complex interactions between 3d and 4f magnetic sublattices influence MC properties. The rare-earth antiferromagnetic ordering induces an inverse MC effect (positive ΔSM) along ‘a’ and ‘c’ axes whereas it’s not seen along the ‘b’ axis, revealing complex anisotropic magnetic ordering. The antiferromagnetic ordering possibly changes to ferromagnetic ordering at higher fields.
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