Recent progress in the development of RE2TMTM’O6 double perovskite oxides for cryogenic magnetic refrigeration

Abstract

• The research progress of MCE in RE 2 TMTM ’O 6 DP oxides is reviewed • The magnetism, MTP and magnetocaloric performances are summarized. • Some of the Gd 2 TMTM ’O 6 DP oxides are considerable for cryogenic MR. The magnetic functional materials play a particularly important role in our modern society and daily life. The magnetocaloric effect (MCE) is at the basis of a solid state magnetic refrigeration (MR) technology which may enhance the efficiency of cooling systems, both for room temperature and cryogenic applications. Despite numerous experimental and theoretical MCE studies, commercial MR systems are still at developing stage. Designing magnetic solids with outstanding magnetocaloric performances remains therefore a most urgent task. Herein, recent progresses on characterizing the crystal structure, magnetic properties and cryogenic MCE of rare earths ( RE )-based RE 2 TMTM ’O 6 double perovskite (DP) oxides, where TM and TM ’ are different 3d transition metals, are summarized. Some Gd-based DP oxides are found to exhibit promising cryogenic magnetocaloric performances which make them attractive for active MR applications.