Abstract
We have investigated the magnetic and magnetocaloric properties of ferromagnetic superconductor Ru(Sr1–xLax)2GdCu2O8 (x = 0–0.10) by magnetization and heat capacity measurements. RuSr2GdCu2O8 shows onset of superconductivity at around 46 K, which coexists with the weak ferromagnetic ordering of the RuO2 moments and the antiferromagnetic ordering of the Gd moments. Both superconducting RuSr2GdCu2O8 and non-superconducting Ru(Sr0.9La0.1)2GdCu2O8 compounds exhibit a large magnetic entropy change due to the field-induced metamagnetic transition. The maximum values of entropy change, adiabatic temperature change, and refrigerant capacity are ∼15.5 J kg−1 K−1, ∼14 K, and ∼125 J kg−1, respectively, for a field change of 0–7 T for both the compounds. These magnetocaloric parameters also have reasonably good values for a moderate field change (2–3 T), therefore, fulfilling the necessary conditions for refrigeration in the low-temperature region.
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