Cryogenic magnetocaloric effect in distorted double-perovskite Gd2ZnTiO6

Herein, we report on the magnetic and magnetocaloric properties of a distorted double-perovskite, Gd2ZnTiO6, through static magnetization and heat capacity measurements, and mean-field analysis. The most pronounced isothermal magnetic entropy change −ΔSM, and relative cooling power RCP are found to be 53.5 J K−1 kg−1 and 620.6 J kg−1, respectively, under a field change of 9 T at 3.1 K with a large adiabatic temperature change Tad of 23.7 K, far exceeding the commercial cryo-coolant Gd3Ga5O12 (GGG). The results suggest that Gd2ZnTiO6 is a potential working refrigerant material for the targeted liquefaction of helium.