Abstract
We have investigated the magnetic and magnetocaloric properties of geometrically frustrated rare-earth indium oxide, GdInO3, by magnetization and heat capacity measurements. It is found that the spin moments of Gd3+ ion undergo a paramagnetic to antiferromagnetic transition below 2 K. At low-magnetic fields, the dc magnetic susceptibility exhibits a clear deviation from the Curie–Weiss (CW) law below 150 K due to the strong magnetic frustration. However, with increasing field strength, the magnetic frustration weakens and the susceptibility data follow the expected CW behavior down to 2 K. The effective paramagnetic moment of Gd3+ ion calculated from the CW fit (∼8μB/Gd) is very close to the theoretical value for S=7/2. The maximum values of magnetic entropy change and adiabatic temperature change for a field change of 0–7 T are found to be ∼21 J kg−1 K−1 (∼155 mJ cm−3 K−1) and ∼15 K, respectively, while the refrigeration capacity is found to be ∼188 J kg−1 for μ0H = 7 T. The large values of magnetocaloric parameters along with negligible hysteresis loss suggest that GdInO3 could be considered as a potential candidate for magnetic refrigeration at low temperature.
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