Cryogenic magnetic properties in the pyrochlore RE2TiMnO7 (RE = Dy and Ho) compounds.

Pyrochlore RE 2 TiMnO 7 ( RE = Dy and Ho) compounds were synthesized using a ceramic method, and their crystal structures, microstructures, and cryogenic magnetic properties were determined. Dy 2 TiMnO 7 and Ho 2 TiMnO 7 compounds belong to the Fd-3m space group with a cubic pyrochlore structure and show a considerable reversible magnetocaloric effect (MCE) in the vicinity of the second-order ferromagnetic-paramagnetic (FM-PM) phase transition at the Curie temperature ( T C ) of 7.6 and 7.5 K, respectively. The obtained maximal values of magnetic entropy change (-Δ S M max ) for Dy 2 TiMnO 7 and Ho 2 TiMnO 7 are 12.50 and 13.95 J/kg K under a magnetic field change (Δ H ) of 0–7 T, respectively. Correspondingly, the relative cooling power ( RCP ) values reach 530.3 and 573.2 J/kg, respectively. [ABSTRACT FROM AUTHOR]