Structural and Magnetic Properties of -Site-Ordered CuTiO ( = Dy, Ho, and Er) Double-Perovskite Oxides with Significant Cryogenic Magnetocaloric Performance.

The magnetocaloric effect (MCE) is currently intensively investigated in various rare earths ()-containing magnetic solids, not only for developing appropriate magnetocaloric materials (MCMs) for cryogenic magnetic cooling but also for deepening our understanding into the inherent physical properties of these materials. Here, we provide a systematic experimental investigation into a series of new CuTiO ( = Dy, Ho, Er) double-perovskite (DP) oxides regarding the structural and magnetic properties, especially for their cryogenic MCE and magnetic-phase transition (MPT). All of these CuTiO oxides crystallize in a -site-ordered hexagonal DP-type structure with the symmetry of the crystallographic space group 6̅2.