Giant magnetocaloric effect in Gd2NiMnO6 and Gd2CoMnO6 ferromagnetic insulators
Giant magnetocaloric effect in Gd2NiMnO6 and Gd2CoMnO6 ferromagnetic insulators
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DOI：
10.1088/0022-3727/48/35/355001
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发表时间：
2015-09-09
影响因子：
3.4
通讯作者：
Venimadhav, A.
中科院分区：
文献类型：
--
作者：
Murthy, J. Krishna;Chandrasekhar, K. Devi;Venimadhav, A.
We have investigated the magnetocaloric effect in double perovskite Gd2NiMnO6 (GNMO) and Gd2CoMnO6 (GCMO) samples by magnetic and heat capacity measurements. Ferromagnetic ordering is observed at similar to 130 K (similar to 112 K) in GNMO (GCMO), while the Gd exchange interactions seem to dominate for T < 20 K. In GCMO, below 50 K, antiferromagnetic behaviour due to the 3d-4f negative exchange interaction is observed. A maximum entropy (-Delta S-M) and adiabatic temperature change of similar to 35.5 J Kg(-1) K-1 (similar to 24 J Kg(-1) K-1) and 10.5 K (6.5 K) is observed in GNMO (GCMO) for a magnetic field change of 7 T at low temperatures. Absence of magnetic and thermal hysteresis and their insulating nature make them promising for low temperature magnetic refrigeration.
