Publication Date:
2014-12-13
Description:
We have investigated the magnetic and magnetocaloric properties of ferromagnetic superconductor Ru(Sr 1– x La x ) 2 GdCu 2 O 8 (x = 0–0.10) by magnetization and heat capacity measurements. RuSr 2 GdCu 2 O 8 shows onset of superconductivity at around 46 K, which coexists with the weak ferromagnetic ordering of the RuO 2 moments and the antiferromagnetic ordering of the Gd moments. Both superconducting RuSr 2 GdCu 2 O 8 and non-superconducting Ru(Sr 0.9 La 0.1 ) 2 GdCu 2 O 8 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.
Print ISSN:
0021-8979
Electronic ISSN:
1089-7550
Topics:
Physics
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